I want to adopt the oldest boy. He seems like such a great kid. He just needs to be allowed to be a teenager for crying out loud. Mom made my blood pressure go up - and sadly, I don't think she will change. The only child I noticed her interact with was the 8 month old infant, she was carrying or holding him quite a bit. I think she is obsessed with the baby phase and loses interest when they grow out of it. I wanted to see Jo go off on her a bit more strongly.
And if Dad doesn't want any more children, he needs to get a vasectomy. He could just tell his wife he is on another road trip and take care of it, hole up in a hotel room for a couple of days to heal. She obviously isn't taking his feelings (or the feelings of the 10 children she already has) into consideration as she just wants more kids to get to the magic number 12. It's snip time, IMO.