teddy was adopted by the brothers birth parents, frank and milena, and they'd have a really great relationship for the brothers, despite the fact that milena always kind of made it a thing where whatever teddy did, it was never as good as the way his brother would've done it. basically though, the brother would be the golden child to milena. but teddy never held it against him and they developed a really close relationship. when teddy had his car accident a couple years back, it was his brother and frank that were there for him to help him recover. we can always discuss more in depth too.