i know you are experiencing great pain! when you see those you love become passive in their faith, it is difficult to bear...modeling those behaviors you would want of them is probably the best way...it is slow sometimes, but if you add prayer to this for their conversion/return to practicing their faith, it may work...i also take every opportunity to bring the Lord/Holy Family/etc into conversations in as natural a way as possible...this is noticed by the young ones I have found...other than that, the choice is up to each individual, and even God does not take that away...i will include you and yours in my prayers for my own...may God be with you...