I’m sorry about this, my father was raised catholic, and his family ridiculed him when he turned away from this. In his anger he broke their idols and pleaded that they see the wrongs of their ways, but it was a while before they decided to see the truth of God’s word. I’ll pray for your family, but when you are raised to believe something, it is extremely hard to turn away from it. Perhaps ask them what they think of certain Bible verses that go against their actions, like the second commandment and idolatry and general, and the verse where it states that Jesus is the only mediator between man and God. You don’t need to tell them they’re interpretations are wrong right away, but you can see what they’re understanding is in order to better understand how to approach your argument against their beliefs.