DEAR ABBY: My father has a mistress! I know this because I saw them together. He doesn't know that I know. Should I tell my mother? They've been married since 1982. There's someone downstairs, so I must finish this quickly! If I tell, I will be betraying my father. If I don't tell, I will be betraying my mother. Help. Please! -- ANONYMOUS DAUGHTER IN BRAZIL
DEAR DAUGHTER: I don't know what you saw, or how you "know" that the woman your father was with is his mistress and not an acquaintance. However, the first person you should tell is your father. If there isn't an innocent explanation, then tell your mother what you saw.