Agreed about siblings. No one is a bad person for picking on siblings, that's just how families work.
Okay. I think my vision of how I see the whole dynamic with Andromeda and Sirius is very different than most, then. She would have been born in late 53/early 54 and Sirius in late 59/early 60 I think. But Sirius did tell Harry in OotP that Andromeda was his 'favourite cousin'. I interpreted that as she kept in touch with him after she left the family to be with Ted, that Sirius knew Tonks as a child...and that Sirius may possibly have brought Remus with him to visit Andromeda, Ted and Tonks. Also that she would have seen him after he went into hiding post-Azkaban. Which may not be real canon, but that is how I write/RP Andromeda with Remus and Sirius. That is what I went off here...and okay, Remus may only be 12-13 years older than Tonks, but Andromeda disliking Remus in canon does not match my vision of her at all, so that was the only reason I could think of. It's probably safer to say that it's yet another part of canon I rewrite. Does that help?