Correct them as we are told to do in scripture, not harshly but with understanding. My mother in law is in an irregular situation, and does not commune. Fact is that if Christ wanted us to continue with divorce as a practice, like that prescribed by Moses then he would have said it?

If people truly understood purgatory how passions are purified, and the Eucharist as God in the flesh and blood they would understand why communion to those in mortal sin, can actually be harmful in this life and the next. Every time I read the gospel of Matthew specifically chapter 10 it reminds me that personal sacrifice is needed to be like Christ.