Shlishi, that is not what family does. Non-frum family needs to see that their frum family members are open and welcoming. How do you think baalei teshuvah are exposed to frumkeit? Otherwise, all you are doing is reinforcing their idea that frum Jews think we are all too good for everyone else.
The frum family members have to maintain warm and open lines of communication with their loved ones who are not frum, while at the same time being extra vigilant over their own actions while in their company. It’s never a bad thing to make a kiddush Hashem, especially if one believes that the true K”H is in front of other Jews.