The parts that are underlined are either Anthony's imagination or Lincoln's (or both).
Either Late 1998 or Early 1999
Anthony: This is…
Anthony: Hold on a second. Just thinking about what I was about to say makes me wanna vomit.
Lincoln: So you're gonna shut up and leave me alone?
Anthony: No, I just need a minute.
Anthony took a few seconds of mental preparation.
Anthony: Ok, where was I? Oh right, the thing that was making me cringe.
Anthony: This is the Loud house. But even though it's called that, it's actually pretty quiet here. It's just me and my mommy and daddy and that's it.
Rita: Anthony, time for dinner.
Anthony: Coming.
Lynn and Rita had lasagna and Anthony had a cheeseburger that was cut into little pieces.
Lynn: Son, your mother and I have some big news.
Anthony: They're gonna make a movie about us?
Lynn: What? No. I'm gonna have another baby.
Anthony: …Oh. Okay.
Approximately 9 Months Later
Anthony was in the waiting room at the hospital. Lynn and Rita came out of the delivery room.
Lynn: Anthony, meet your baby sister Lori.
Anthony: …..Why is she so ugly?
Baby Lori started crying.
Anthony: And then Lori would stop crying because somebody gave her Fa Fa, and then me and your parents would get annoyed by it, so your mom would say "That toy is driving me so crazy, I don't wanna have any more children!," and then…
5 Pregnancies Later
Doctor: It's a boy!
Lori, Leni, Luna, Luan, and Lynn Jr.: It is?!
Anthony: FREAKING FINALLY!
Anthony walked up to his parents. He took a look at his first brother.
Anthony: I like him already. What's his name?
Rita: Abraham.
Lincoln: What? Why isn't my name Lincoln?
Anthony: Duh! If they already had a son named Anthony, they wouldn't feel the need to give you an L name. They'd give you an A name. Unless the fact you and all your sisters' names start with L is just a coincidence.
Lincoln: Look, if you're gonna keep doing this, the least you can do is still have my name be Lincoln.
Anthony: Ok, fine.
Anthony: What's his name?
Rita: Lincoln.
*montage of Anthony and Lincoln doing fun brother stuff throughout the years*
2015
Rita: We had ANOTHER kid!
Anthony: Oh yeah, because we don't have enough people living here already!
Lynn Sr.: Come on Anthony, don't be like that. Now come meet your new sister.
Everyone went over to their parents.
Anthony: I'm telling you, there's no way…
Anthony looked down at the new baby and his jaw dropped. The baby opened her eyes, looked up at Anthony, and smiled. And then…she pooped…because she's Lily.
Lily: Poo Poo!
Everyone except Anthony was grossed out by the smell. Anthony picked up Lily and then he…sang.
Anthony: AND I...HOLY POOP!...WILL ALWAYS LOVE YOU!
Lincoln: ….Isn't that song about somebody dying?
Anthony: Yeah, but I feel it can work in that kind of situation too. So, the next thing I think would happen is…
Lincoln: What point are you trying to make? All you're doing is putting yourself in the birth stories of me and my family members. It all seems pretty self-explanatory.
Anthony: Yeah, this is turning out to be a lot less interesting than I thought it would be.
Lincoln: Let me have a turn. I bet I could do a heck of a lot better than you.
Anthony: Alright, just let me do one more.
Lincoln: Is it as stupid as the other ones?
Anthony: I don't think so.
May 2017
Anthony went to Grace's house and knocked on the door. Grace opened the door.
Grace: Hello.
Anthony: Um…hello…..This may be a lot for you to take in, but…when my dad got pregnant with me, you were his girlfriend, so…
Grace: …You're my son?
Anthony: …Yeah, I guess I am.
Grace: …..Oh, you were right, this is a lot to take in. Here, come in, come in.
Anthony and Grace went inside. They had a long conversation about how they were mother and son but never knew it. Then Lightning…oh wait, she wouldn't have that nickname…Leigha came downstairs.
Leigha: Who's this guy, mommy?
Grace: Leigha, meet your big brother Anthony.
Anthony: Of course I have another sister! And of course her name starts with L! And of course it's 4 letters!
Grace: Actually, it's 6.
Anthony: Oh, sorry.
Grace: It's okay. A lot of people make that assumption.
Anthony went over to Leigha.
Anthony: Lovely to meet you, little sister Leigha.
Leigha: Bacca beeka ooka chocka!
Anthony: …Does she do that a lot?
Grace: Unfortunately.
Anthony: …Well, it was nice knowing you, Ms. Staffenhagen. But I've really gotta go now.
Anthony got the heck out of there.
Leigha: …Was it something I said?
Anthony went home.
Lynn Jr.: You found out that Grace Staffenhagen is your biological mom and you left because you thought her daughter was annoying?! Are you insane?!
Anthony shrugged.
Anthony: There, I'm done. Now you can take your turn.
Lincoln: Gladly.