Wow, this sounds like a train wreck! I hope you can give these little guys a fighting chance. That seller is the snake equivalent of a dog backyard breeder!
You've gotta do the best you can and don't forget about them with the new baby coming and the wedding and all the external factors.
At some point you WILL need to spend some money on quality setups, and I don't recommend keeping the male and female together for long.
Certainly don't try to breed them down the road.
Keep your chin up and try to enjoy them. I wish they were older and established eaters but with a lame breeder there is no way to tell. This could get tricky if all doesn't go just right.