I spent a while searching for a story on ff.net that I had originally seen there. This post means I had no luck.

Essentially, Harry was transported back in time (I can't recall from when) into an alternate reality where his family is still alive. He takes the place of his younger (before Hogwarts) self after he was supposed to die in an accident of some sort. His other self was a dick, and his family is surprised by how nice he is now acting. His family includes his parents and several siblings, one of which I remember is a young (baby?) sister named Lily. There's tons of sappy family stuff between Harry and his mother and Harry and his youngest sister. I also recall Sirius being married and having (at least) a daughter who ends up having a crush on Harry.

As you can see, I don't remember much of the plot, but I don't think there was much of one. I'm looking for this because, as long as the writing isn't much worse than I remember, I should be able to garner some enjoyment from the fluff.

 

Sounds like Harry Potter and the New Life to me. There also a slew of rewrites out there so it may have been one of them you read.

 

Yes, that's much worse than I remember. My search for a decent fluff story that I haven't read in the last several years continues.

Thanks for the help in finding it though.