When believing the Lord to bring in unsaved loved ones, here are some scriptures to keep in mind when your praying.
"If two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father, which is in heaven." - Matthew 18:19
"With God nothing shall be impossible." - Luke 1:37
"Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house." - Acts 16:31
Stand on the promises of the Lord; and believe that He will bring in your loved ones. Don't give up. Keep seeking, asking, and knocking. The Lord loves you!