Stay on the Gospel itself, and explain to them just how we can know for sure that we are saved and right now have eternal life in Christ, as no sincere Catholic can say that this is their experience.So in summary, we should talk with them as we would any person and maybe start with the things we agree on (Trinity, sinless life, death, and resurrection of Christ, inerrancy of scripture) and then move to scriptures about justification that make it impossible to remain a Roman Catholic?
I am trying to plan my next conversation with a RC family member and want to have a plan.