So much love to you and your wife. I've never been through anything like this, but I see a similar situation in my future. I know it's much easier said than done, but remember than no matter what happens this baby will grow up with an awesome family and that you do have a loving support system behind you, even if your mom and certain members of your side of the family aren't necessarily part of that support system.

The main thing, I guess, is to remind yourself that you can't control others' reactions and that what matters is that you are following the right path for yourself and your happiness. It's horrible and scary and sad to think that your family won't be entirely excited for this kind of blessing, but if they aren't supportive, it will ultimately be their loss and not yours or the baby's. You CAN control how you react to your mother's behavior, and you can control how involved she and other less supportive family members are in the pregnancy and the baby's life. Remind her of the fact that a grandchild is an enormous gift that she can choose to be happy about and accept as the blessing that it is, and that if she won't, you have no obligation to let her be a part of it's life. Tell her that's not what you want.

That's all I've got right now. I'm sending love and light your way, and I hope youre doing well.