Family issues -- we all got 'em (or at least so it seems). Even in my husband's family, which seems like the most 'normal' family in my wildest dreams (compared to my own, anyway), there still are issues.
Sylvain, I thought of you today as I was watching a TV show on 'Animal Planet,' with a girl in the UK who had a 16' python that she had taken in from someone who felt it was too dangerous to keep any longer. (This girl had a LOT of other snakes and lizards, so definitely not without experience.) The show was centered on taking this snake to the vet to be weighed and measured; but as they were trying to get it into a bag and a box for hauling it there, she could tell it was in a bad mood; then, at the vet's, the snake actually bit her on the arm ... so they gave up the idea of measuring and just weighed (although I didn't catch what the weight was). Yikes, I confess to being a snake lover myself, but when they get to the size where they could actually eat you I don't think it's a very good idea to keep one in your house... Kind of like keeping a dangerous bull in the barn, or something.
So -- maybe I just missed it, but how large is Lucy, actually?
And, I would also like to say kudos to you for offering to have your dad come to live with you; whatever difficulties that will present, I'm sure you will never regret it!