Dear Abby: Is it weird that my boyfriend and his mother pretend to be siblings?

Dear Abby: My boyfriend, “Evan,” and his mother, “Mitzi,” tell people they are siblings. I love my boyfriend, but I don’t feel comfortable lying for him, and I wish he wouldn’t lie for his mother. Evan is in his early 30s. His mother is in her early 50s, though she tells people she is 10 years younger.