Question: Should people call their parents-in-law "Mom" and "Dad"? My brother in law started calling my parents "mom" and "dad" – and in turn my sister now calls his parents "mom" and "dad". This seriously offends me. My parents earned the title of mom and dad. They RAISED us – they cared for us, educated us, taught us values, loved us, and corrected us when we were wrong. My relationship with my parents is one of the most important relationships of my life and one I don't take lightly. I would never think to call anyone else "mom" and "dad" because no one else has even remotely earned it. It would only cheapen the relationship for me. I think my brother in law is being too familiar with my parents, and disrespectful to his own (and vice versa for my sister). Are my feelings valid? And what can I do about them if they are not?