Mother-in-law thinks her son is ‘living in sin’

Dear Carolyn: I have a great boyfriend whom I’ve been with for several years, and we just bought a house together. The problem: His mother thinks we’re living in sin because we’re not married. She tells her son this about once every three months. I have a major problem with people intruding on my personal life when they’re not invited.

I can’t say anything to his mom because she hasn’t addressed me directly yet — although her last email came perilously close to calling me a woman of loose morals — but everything the boyfriend has tried so far hasn’t worked. Of course, if we…