A Big Thank you

I sent a thank you card to my biodad today. He sent that duck picture and book for Christmas for J and I was touched by it's deeper meaning. I thanked them for being kind and gracious to us even though it was strange circumstances that brought us all together. He wrote back and said he loved us and his son asked for my e-mail so he could correspond. I wrote back that I didn't mind at all and I think we really clicked the first time we met (just wrote yesterday how much we had in common.)
Then he sent me a card tha read
I think of you three often and marvel at how a mistake I made in my youth turned into something wonderful!
Isn't that sweet?