I am looking for a fic where they are raising a little girl. I believe it's Justin's and a friend of his. The friend is dead but the sister and grandma show up and want to visit with her and Justin refuses or forbids it because of things is friend had said in the past. Brian feels bad for the Grandma and sneaks visits behind Justin's back.
found: My Girl by Krissypig
https://web.archive.org/web/20081231131928/http://oz-expression.nu/qafpig/mg_main.php thank you blklizard