Couple of things that could help.
1) Remember God’s promise, “Believe on the Lord Jesus Christ, and you will be saved, and your house” (Acts 16:31). Your faith opens the door for God to work in your relatives’ lives. Trust Him to do just that.
2) Put everything and everybody into God’s loving and powerful hands. Remember, worry and fear are a sign we are in charge of that area because when we’ve surrendered that area to our loving and powerful Lord and simply trust Him with it, we have great peace. (There’s nothing we can do about it anyway.) If there’s anything the Lord wants us to do, great, but it’s out of faith, not fear. Rest in Him.
God bless.
Thx.