There will be learning pains, Sonic just wants to take them on adventures and have fun all the time. Shadow's only concern is they can fend for themselves and teaches them to fight, and i think both of them will have their own issues and hangups in seeing themselves as dads. lucky for them they have a support network of friends ot help them out, i definitely think they will play a major role in helping raise those kids right cause both dads are kinda stupid.