you might need a new sil! my son has a ball python that i gave him when i stopped teaching. she's 24 or older and has gotten quite cantankerous. fortunately, she stays in her cage and doesn't roam the house any more. she used to surprise my son in the bathroom on a regular basis. i guess she liked the cool tile. i don't mind snakes, but i don't like being surprised by them or any other critter. i'm not so brave when they're hissing at me! or sliding up my leg! or looking up at me from under the sofa cushion. all things that have happened! when i used to take her for story hour she would hang on my neck and a couple times went down inside my dress. i always held onto her tail so i had control of her.
they are really good mousers. but i didn't encourage her to wander!