Warning: SPOILERS for Avengers: Endgame When Tony Stark first launched the MCU in Iron Man, he did it from the shadow of his father's legacy. Avengers: Endgame used time travel to make peace with Howard Stark, but as heartwarming as Tony's bond with his father may be, the movie may have revealed that it wasn't biological--and that Tony was adopted by Howard and Maria Stark.
Tony blinked and it took him a moment to catch up as he looked from the baby in Lina's arms and then back to Lina. "Wait, are you saying that- ""Congratulations," Lina said dryly as she put the baby in Tony's stunned arms. "You have a daughter. Ivy meet your father. Tony meet Ivy Colette Stark. Your daughter."