User blog comment:Soniczero000/Has anyone notice?/@comment-4533965-20121115221058

I like to say something about this:

Sonic and Tails have always treated each other like brothers, mostly because, in the Sonic the Hedgehog 2 manual (Japan, I think), Tails wanted to be like Sonic before meeting him.

Amy and Cream are similar to how Sonic and Tails treat each other. Big can count on the list, if you want.

As for other characters, I really don't know. I mean, they are quite like family, but still, you have a good idea going on here.