Who said "I've learned that family isn't always blood."?

This quote is attributed to Black Widow / Natasha Romanoff.

I've learned that family isn't always blood. - Black Widow / Natasha Romanoff

"I've learned that family isn't always blood."

Black Widow / Natasha Romanoff Family

"I used to have nothing. Then I got this job, this team. It's all I have."

"Compromise where you can. Where you can't, don't."

"I'm always picking up after you boys."

"The world doesn't change without sacrifice."

"A man's home is his castle."

"Family is everything to me."

"Life's greatest treasure is the love of family."

"A woman's place is in the home... making it a happy one."