I don't mind who knows I use the cards now but for quite a lot of years, I was very careful who knew about it. I have great empathy and understanding for those who are still in that boat. Two of my children (I'm a great-grandmother) are okay with it and they use the cards, too, but my two sons weren't thrilled. The oldest is pretty religious so he doesn't like that I do it, and my younger son doesn't openly state any opinion either way but he's got so much to deal with right now that my telling fortunes just doesn't enter his mind.
Like gregory said, it's your father's house so no matter how old you are, you should respect his rules. I'm sure you understand that as well without our mentioning it, though.
But maybe you can keep your deck in your backpack or some other personal place that he wouldn't run across it and then just don't use the cards while you're actually at home.
Do you have a phone app for Tarot? I've never tried one but lots of other members here use them a lot and say they're as good as an actual deck.
I've considered this forum my Tarot support for the most part for many years now. I've made lasting friendships here and it's a wonderful source of information and moral support. Especially for those who feel isolated from any positive support from friends or family for their card use.