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CJ first met Tony Stark when she was only 12, after breaking into his lab and stealing many of his weapons.

A year later, after trying and failing to defeat Thanos, CJ is left alone with Tony Stark for 3 weeks and forms a close bond with him.

5 years on, Peter Parker returns to find his 13 year old sister is now the 18 year old daughter of Tony Stark.

Post Spiderman: Homecoming to Post Endgame

Films covered (kinda) :

Infinity War
Endgame