One of our obligations as christians is to bring other people into the knowledge of our Lord Jesus Christ just as someone was did us. And the people to begin this with who are not knowledgeable about it is our relatives. This is the greatest gift we can ever give to them. It goes far beyond any material gift.
Our faith is not something we should keep hidden, most especially from our family. The Word of God is light to whoever that embraces it. And this is what the Word of God had to say concerning that light:
Luke 8:16 KJV
[16] No man, when he hath lighted a candle, covereth it with a vessel, or putteth it under a bed; but setteth it on a candlestick, that they which enter in may see the light.
It is an error to be enlightened by God's Word and hide it away from people. Embracing the Word of God illuminates us from within and it is expected of us to show forth that light to people around us, especially our relatives. As long as we are practicing the right faith we should endeavor to convince people around us about it
We should convince our loved ones with love and kindness