Mrs. Natasha Rogers? (I Think You Mean Stark)

The red light over the doors blinked once, twice, and a third time to signal that they would open in exactly three seconds, and Natasha quickly tightened the buckles that strapped her bags to her body. The second the doors opened, she swan dived out of them and fell into a natural roll as soon as she hit the ground. Bucky followed her, but had the advantage of being able to land firmly on his feet without shattering his legs.

“Mama!” A drawn-out, high-pitched shriek came from the entrance to the landing pad. Natasha looked up and barely had time to open her arms before a five-year old ball of energy barrelled into her. _

Or, Natasha leaves her husband and kids to go undercover as a Rogue. Six months later, she comes back- with the Rogues in tow.