I was living at home and keeping a Iguana hidden from my parents. They had no clue I had this thing, I was careful about bringing him out and getting supplies into the house. He was a yearling when I went camping with a friend, my mom had found him Well she was more worried about the light (on timer) and the under tank heater, this was left on. My mom had thought I forgot to turn these things off! So she unplugged it all during mid winter, closed the heater vent in my room since nobody was going to be in their. Needless to say my Iguanna froze to death It sounds to me like you could keep your snakes as you seem to have some control over your parents. Whatever you do, your going to do what you want anyway, dont make the mistake I did! Maybe once you get the BP tell them you have had BOTH of them for a year already, they might just let it go as they had no clue that they were even in the house for so long

Good Luck!

the tub looks fine, make sure it has good flow of fresh air!