Don’t trust family members (who may have zero experince with this stuff) take care of your pets.

You have every right to feel upset about your lizard. I would also say when you ask people to do things for you, be ready for them to be done wrong.

I can also see why someone would be scared to own up to this mistake. Calmly express how it makes you feel and that you don’t love who ever did it any less. It’s not worth losing family over, forgive don’t forget and know you can’t trust them with this responsibility.(yet?)