I really wish I could give you THE answer. Regrettably, thousands of years of human knowledge on this point has served up only this: It's a dang crapshoot. You have created two unique humans and sent them spinning off like tops into a very complex world. They may fight like cats and dogs as kids and become thick as thieves as adults, or they may be little buddies as kids and maintain (at best) a cool civility when forced to interact at weddings and funerals.
Narcissistic parents are typically more focused on appearances and admiration from others and have little mental space to care for children the way healthy parents might. They can be emotionally needy and constantly crave validation from those around them, including their children. Such environments exact a heavy psychological toll from children, ranging from a lack of boundaries to fear of commitment and abandonment, which can sometimes take a lifetime to heal.
