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~ Tony & Nat didn't die in Endgame here ~

After they came home, Tony realized how lonely Nebula is without her sister. While everyone were hanging out with their family or friends Nebula is just there doing nothing alone. So Tony decided to adopt her. She's now Nebula Jordan Stark (she needs a middle name, ok!) though in his condition. She and Morgan became good friends and she promise to always look out for Morgan and protect her in every situation

Because this is just a description I'm going to wrap this up quickly. Tony would adopt Peter and Harley later on.

So here you go... The everyday life of The Stark Family