That's an excellent question. I do not know if you're familiar with the wirk of Anthony Magnabosco, but his "Street Epistemology" is the perfect soft-glove approach to use with family members. Above all else, you want to avoid antoganizing them. Doing that can have terrible reprecussions in family cohexiveness.

If you Google his name of his method, you will hit the other lode of useful methodology.

Did that answer your question, or were you looking for more of a laundry list of what's wrong with Trump's truth claims? I chose to avoid going for the low-hanging fruit first.