Parents-
Sonic×Amy
Silver×Blaze
Shadow×Rouge(Or children made from test tubes from either ONE parent)
Knuckles-Adopted Child(CAN ONLY BE ADOPTED NO RANDOM LOVER WITHOUT ANY ACTUAL RELATIONSHIP BEING REFERENCED OR ANYTHING)
Tails- Adopted Child or younger sibling, or Apprentice
Cream- Adopted Sibling
Vector×Vanilla-Adopted Child(Cream's adopted Sibling)
Dr. Eggman- Assistant or adopted child, or even one of his robots
(Anyone got anything else?, You don't have to be a child or anything related to the Canon characters, you can have your own family and such, but remember the parents aren't here.

No one can have like 5 children ok?, Maybe adoption can be involved but I'm not allowing someone to just have literally 5 children.