For anyone wondering this entire fanfic is based off of Terry Fator's song Horses In Heaven I was gonna make it into a oneshot songfic but I had so much I wanted to do with this story and I might add a different ending from the song but I may keep it the same so listen to the song and let me know if that's how you want the story to end or if you want a 'happier' ending and we get Jaces Pov in this to see how he is coping with a son and Mason finds out Jace is his dad

Jace's Pov

I sat down in a chair after Clary left the room I was terrified, not only do I have a son and that's terrifying on it's own he had cancer I kept trying to force myself to stand up and walk into that room I knew I had to go in there and be there for him, he thinks his father is some asshole who never wanted him and doesn't care that he has cancer… I can't let my son die thinking I hate him, I never thought that I would say any of that in my entire life I never thought of having kids and if I did I never would have thought there would be a chance my child would die before me, I leaned back in the chair and looked up the room had painted clouds on the ceiling tears came to my eyes as I thought of him trapped in this place where he was being poked and tore up. My phone started to ring I pulled it out and seen Izzy's name flash across and I smiled a little bit she always seemed to cheer me up when I was feeling bad.

"Hey Izzy.."

"Hey so I just wanted to know what time you are going to the airport so I know what time to leave my house to pick you up."

"I-I don't think i'm gonna leave."

"Jace you have a game tomorrow, this is why I wanted to come so you wouldn't meet a girl and waist time my dear brother."

"I'm not waiting time. I have to stay."

"Give me one good reason why you want to stay?"

"My son."

"Your what? Jace please, please tell me you didn't have a fling last time you were here and got some random chick pregnant?"

"No."

"Then tell me what's going on!"

"I met my son today and he thinks I don't care that he's-"

"Stop… I'm confused Jace you don't have any kids let alone a girlfriend and no I don't consider her your girlfriend she wants to be your trophy wife and you are too dumb to see that and oh my god if she's pregnant I will kill you."

"Clary." I said and I could hear her cough.

"Clary? As in the Clary you completely destroyed when you broke up with her, Clary?"

"Yeah when we broke up she was pregnant and my son he's.."

"I have a nephew?" She said and I could tell she was excited. "Ohhh I need to meet him does he have your hair or your eyes?"

"He has my eyes but I don't know about the hair."

"What do you mean?"

"He's sick Iz."

"With like a cold or flu?"

"Cancer." I said and it was silent I have never known Izzy for having nothing to say and then I heard my mother's voice.

"Jace what did you do to your sister?" She asked and I could hear Izzy crying now.

"Mom I can't come home for awhile.."

"Why not? Are you in some kind of trouble?"

"You remember Clary right?"

"Of course I remember her she was over at the house everyday until you broke her poor heart."

"She came to tell me something when I broke up with her."

"What did she want to tell you?"

"I have a son mom." I said and it was silent again.

"Your sister is not crying happy tears Jace did something happen to him or Clary?"

"H-he has cancer mom, he's not doing really good and I just- I can't leave him- I can't do it I can't let him die and not let him know i'm his-" I stopped talking when I said that and silent tears started to fall down my face.

"You take your time with your son I will talk to everyone and keep them at bay until you can come back."

"Thank you mom and can you have Izzy call me back when she calms down some."

"Sweetie Alec, Magnus, and Max just got here and they are all asking Izzy why she's crying and I don't think I can lie to them.."

"It's okay mom you can tell them. I have to go but i'll talk to you later okay?"

After I got off the phone I walked back to the room I didn't notice it before but there was a drawing on his door it was of a horse and stars and a someone riding a horse and above that in big letters it said Mason in different colors I walked in the room and Clary had her eyes closed and he was holding a stuffed horse he looked up at me and smiled. "Mommy didn't know if you were coming back."

"I had a few calls to make."

"I'm glad you're here I don't get many visitors."

"You don't?"

"Just my mom and uncle Simon he went home for his sister's wedding I wanted to go but i'm too sick." He said sadly.

"You're still here." Clary said sitting up.

"I'm not here part time." I said and she gave me a sad smile.

"What are you guys talking about?" Mason asked.

"Bubba you know how you said a few months ago how you wanted to meet your dad."

"Yeah but you said-"

"I was wrong Mas."

"So I get to meet my dad, when?"

"Right now." She said and looked at me.

"Hey…" I waved and he looked at me and then Clary and then back to me.

"This isn't funny mommy."

"I'm not kidding boo.. Jace is your dad."

"My dad is a famous football player." He said looking down and then he jumped up and ran towards me and jumped up.

"Mason! Be careful." I looked at her and she pushed his IV machine towards him.

"You really are my dad?" He asked smiling.

"Yeah I am and I do care about you that's why i'm staying here for awhile."

"Are you serious?" He asked and I nodded he put his head down on my shoulder and sighed happily. "Uh-oh."

"What's wrong?"

"I don't feel too good." He said and Clary moved towards me and pulled him away from me and he threw up all over her. "I'm sorry mommy."

"Like I told you the last time you threw up on me, you've done much worse on me."

"One time when I was small I had an accident on mommy because it was the first time on my medicine. I cried because I felt bad but mommy didn't get mad at me." He said and Clary placed him in bed and hit the nurse button.

"Can you watch him while I get changed?"

"...Yeah…"

"What's the problem little man?" Someone asked when they came in the room.

"I don't feel good…" Mason responded tiredly.

"What were you doing?"

"I ran to my dad."

"Your-" He looked at me and then back to Mason. "I don't think we have ever met in the two years i've known him."

"I uh just uh…"

"Mommy never told him about me." Mason said shrugging.

"I don't think Clary told you this but he's not really suppose to be out of bed right now he just had his third round of chemotherapy and it's taken a lot out of him so that's why he's been throwing up but he's getting better right little man?" He high fived him and laid down.

"Do you think there are horses in heaven?" He asked when the nurse left.

"Huh?"

"I'd like to know if there are horses in heaven before I die."

"Hey don't talk like that."

"I like to think there are horses in heaven I wish I knew how to ride them." He said picking up his horse. "Mommy says she will take me when I get better but what if I don't?"

"Mason-"

"I want to get better dying is scary sometimes when they give me the chemo I can't speak because i'm so tired all the time I can't leave the room most of the time because i'm too weak and mommy cries when she thinks i'm asleep she's here all alone she has no one to hold her and say I will be okay and I can't leave her, I don't want to leave her." He said and Clary came back in the room.

"You okay bubba?"

"Yeah mommy i'm fine." He said and smiled.

"Try and get some sleep okay baby?" He nodded and Clary pulled me out of the room. "How long are you staying?"

"Uh I don't know."

"I'm asking because they are gonna start a cycle and that means he's gonna have one week of chemo and then they are gonna let him rest for three weeks and I just want to know if you are gonna stay or go back home and do your job or whatever."

"My mom is trying to get me some time off so I can be here and I want to be here for him and you, you don't have to do this alone."

"Did you tell her that he has cancer?"

"Yeah I did… Was I not suppose to tell her?"

"No i'm glad you did."

"I told Izzy too so you might want to expect her here tomorrow or something." I said and she laughed.

"Jace but right now he's good it gets bad really bad and I don't know if you-"

"I have to be here Clary I missed the first five years of his life…. If worse comes to worst I will not miss his last."

"Thank you for being here." She said and kissed my cheek and went back into the room.

The rest of the gang will make an appearance in the next chapter.