3 - Invite them to non-threatening events at your church, i.e. women's teas, mens breakfasts, dessert theaters, etc. Let them be around Christian 'things' as much as possible, i.e., the cross, Bibles that usually lay around churches, actual people inside the church building in the daytime if possible during the week, etc.
4 - Listen to Christian music while they're around you so that they hear the words.
5 - Have your Bible open to various passages of scripture when they visit.
6 - Make sure you're the one that does the praying if the occasion arises and grab their hand to hold it during prayer. Never fold your arms while praying with a Mormon and don't allow them to do the praying. They are not praying to the true God of the Bible, therefore this isn't something you'd want to submit yourself to either.
7 - Ask them various questions about the church. As you know this will cause some animosity at some point but it does give them something to think about. Ask them their opinion about things like D&C 7. The entire section is how Peter, James and John never died. If this were true then why was there a complete apostasy and the need for a restoration as Joseph Smith claimed?