Mack/Bucky
Then you know one thing about our mother, she loves her children without a doubt. You have all the proof you need in my big brother that you are one of hers too.
I know it was ugly without all the details. But you know her. She's still the loving woman that said yes, without hesitation, when there was question about adopting you. She's still the same woman that threatened to eat somebody because they were showing you attention that scared her.
I'm not saying be all happy families if you don't want to, but if she asks... Tell her.