You should pick a time when your family decides to have a talk just to talk. They will notice sooner or later! Best totell em first! They may not like that you kept it secret if they find out themselves!
Given your young age. I would think it true how you are to tell them. And how much.
Nad maybe not use the words like magick and rituals. And any of that.
They care to bring a bad effeckt at ones for others. Espesialy when it comes related to younger people.
But that's parents.
And they want to proteckt you, and if there is somthing they don't understand. They wount like it.
But there are ways to tell them. And showing them that there isn't anything to worry about.
(not that I'm good at explaining them. But you seem like a mature Kidd competed to your age. So I supose you find a answare somewhere)
Yes true. Just dont use words that would throw them off or state something good about it. Dont say things about"black magic", more like what i did, is state (if your wiccan) the basic rules are"harm none, do what you will".