Quote advice for adoptive mother

Aimee

I'm having a portrait commissioned for my boyfriends mother. He is not her biological child, and she didn't become his mother until he was older. I am going to have a portrait done of her holding him as a baby/toddler, but I need a good quote to put with it. She never got to hold him as a baby, and so I want something along the lines of a mother that stepped in/missed time/etc. Any quote ideas?