There is nothing wrong with a woman taking off her Hijab in front of her mother’s maternal or paternal uncles; she may shake hands with them and be alone with them, because they are Mahrams to her.

A Muslim husband has the right to forbid his non-Muslim wife to commit evil openly in the house such as setting up statues or ringing bells. This also includes celebrating innovated festivals, such as Easter, because that is an evil action according to Islam. The Muslim husband does not have the right to force his Christian wife to give up her beliefs, but he may denounce her open profession of falsehood.