I'm (shamelessly) tying this into another story I'm working on, "And Baby Makes Three". The song is "The Living Years" by Mike and the Mechanics.
It was times like this he hated the Time War and the Time Lock. He always hated it, for taking away his homeland, for taking away everything he ever had, but times like this really took the cake. His relationship with his parents was always tenuous at best, but he wished they could see him now.
He had new friends, he had Rose, and now, life was really getting better. He had a son, David. He loved that little boy more than anything. He wished they could see that it was indeed possible to start over, after losing so much. A part of him felt guilty, but he knew that if the roles were reversed, he wouldn't want her to be alone and miserable forever. He'd want her to, after the sting and reeling was over, be able to start over, too.
One night, the Doctor took a walk outside by himself. He looked up to the sky and said, "Guess what? I've started over. I wish you could see everything. I have new friends, Sarah Jane, Mickey, Jack, Jackie, Luke, Martha, Donna, and Wilf. They're a great lot. I think you'd like them. I haven't remarried, but I'm with a wonderful woman. Her name is Rose. You'd love her. She's the most wonderful woman in the universe. Oh, and I have a son. His name's David. He's a beautiful little boy. You'd love him, too. He and Rose are the best things going in my life." Tears flowed from his eyes as he said this.
"I wish you could meet him. I'll tell him all about you when he gets older, I promise." With that, he walked back to the TARDIS, and closed the door behind him. He sat down on the captain's chair and rubbed his eyes.
"Were you talking to your parents again?" Rose asked.
"Yeah, I told them about David. I wish they could see you, see all the friends I've made, and I especially now wish they could see him. I told them the two of you are the best things in my life," he said with a grin. She smiled at this, too. He got up, and they went to the nursery, where their son was asleep in his cradle.
"I wish your grandparents knew you. They'd love you so much," he whispered, gently kissing his son's head. With that, the Doctor hoped that he and David would get along better than he did with his own parents.