I can imagine that
You must be so proud of your boys! I don't know how it is to have children, but I love my sister like she's my daughter. I was almost 10 when she was born, but since I was 4 I asked my parents for a baby sister, and she had to be pretty, with hair of the color of honey, eyes of the color of the sky and big cheeks so I could kiss her. And she had to be named Sophia. And then, 6 years later, she came to me.
I remember a it was yesterday the day my mother said to me she had to go to the doctor, and I guessed "You'll see if you're pregnant!!". I remember when she came talk to me and said "I've got something to tell you...", and I said "You're with child!". I remember I always knew it was a girl, I called her in my mom's belly, and she turned to me. I remeber the day she was born, she wasn't supposed to be born that day, but I had a feeling, I prepared her bed, all her things, and I said to my mom "She's coming today, mom.". And she came. My little sister, my little golden sister... I wasn't the one who gave birth to her, but I changed her diapers, I nursed when she was sick, I put her in the bed everynight since she was a baby, I hold her hand when she gave her first steps. She eventually call me "Mommy", and that's nothing in the world I'd change it for.
I think that's very close to how a mother feels like.
Actually, my sister is responsible for almost all the troubles I get in. She can uses me as her poney in public, as she had done more than once, and I don't mind.