Talking to family members is tough. I get more scared talking to my own family than I do to strangers on the streets. I think it has to do with the fact that if I make them mad, I am still going to have to face them again, unlike with people at the mall where you will most likely never see again. None the less, the Law and God's justice still applies to them so work up the courage and take them through the Law and if it makes you feel any better, I have talked to my family members and they have never been mad at me. Last but not least, perhaps you can try and give them your testimony and therefore you are convicting yourself and then ask them what they think about it and then have them apply the Law to themselves.