As someone that doesn't talk to their parents and has no intention to, I think your dad and his wife are insane but I would at least ask them why they are trying so hot when you have made it abundantly clear that you do not and will never think of her as your mom.
You have gone a decade without knowing why though my guess is that she can't get pregnant or something.
He said it would never be that again and I honestly wouldn’t because he’s already sleeping with other people. I could never be just an option
Sounds like you're both making a bigger deal of this than it needs to be.
Dump her
As someone that doesn't talk to their parents and has no intention to, I think your dad and his wife are insane but I would at least ask them why they are trying so hot when you have made it abundantly clear that you do not and will never think of her as your mom.
You have gone a decade without knowing why though my guess is that she can't get pregnant or something.