You might even add Ishida in there as a child as well. I can't see him hating Shinigami totally if his mother, auntie Yoruichi, Uncle Kiuske, and Uncle Isshin all happen to be Shinigami themselves, even if they did go rogue at some point. In fact I could see Isshin almost declaring himself as Ichigo and Tasuki's protectors much the way Soi Fon was supposed to protect Yoruichi. (Even he could see them getting together, much to their ire and embarassment whenever any of the parents, or Ishida himself, mentions it. After all, they're "just friends." Thus he has to "protect" Ichigo as well.) I still see him hating Mayuri, though. And you know Kiuske at the very least would recognize his handiwork in kidnapping Ishida's grandpa. That means Soi Fon most likely would as well. If not, Yoruichi would probably tell her.
Hullo thar Shunpo and Hakudo trained Quincy Ishida looking to take a shot at Mayuri once he can get to him. Mommy's going to teach you how a real Shinigami fights, then you can avenge grandpa.