I am blessed that my immediate family (husband and 2 daughters) have a personal relationship with the Lord, as do I. However, for many years my oldest sister, although she knew the Lord she had not accepted him into her life as her personal Savior. Well, for many years I would bring up the discussion of Salvation whenever I would talk with her, I felt as a Christian if was my duty to help her "see the light." Well, one day the Lord helped me to see that "I" was not the one who would be doing the saving in her life, I had not even saved myself, He would save her when the time came. He reminded me that I was simply to show her the way not choke her on the way. So, I let up and I didn't bring it up anymore to her after that. Well, 6 years ago my mom passed and it affected my sister. My mom loved the Lord and often talked about how she was looking forward to "going home" someday. Well, we knew mom was home and we had yet to get there. I have an older brother who is a pastor, he is very close to my oldest sister. He then started talking to her about giving her life to God, but again, she would not have it. Then, one day she was arrested on some charge she had no idea of what they were talking about. She sat in jail 3 months before everything was cleared up and she was released. However, during that 3 months the Lord paid her a visit in her cell one night and by the end of that 3 months she was holding bible studies for the inmates and didn't want to leave because she felt many were so close to accepting Christ and she felt she could help them. Well, she does prison ministry now and she very involved in my brother's church and she loves the Lord. All I did was pray...God did the rest.
I share this because even with my prayers God did things in his time and his way...his understanding is not our understanding, his ways not our ways. He made her weep when he alled her to be put in jail but in doing so he dried her tears for once and for all. So often as Christians we feel it is our duty to save someone, but all we are to do is introduce them to God, and then let God save them. If they don't accept Him, simply pray without cease for them...but the final decision is theirs.
Stay encouraged and know, God may not use you to help save that family member, but there are plenty of others he will send your way...be ready.