conversion of my cousins

my 4 cousins are in their late 20's and early 30's. Basically they are good loving human beings who just happen to be lapsed Catholics. Its very hard to persuade them to attend regular Mass because they are put off by the behavior of the regular mass goers who are not the best of examples. I do wish for my cousins to return to the church and the sacrements before its too late. Please pray for them. thank you.