Should I tell my step-father that my mother is a lying gold-digger?

Please, this is not a joke! My mom has been gold-digging since I've been born! Now, she has a new boyfriend and he's about 58 and she's 34. She's very pretty and men do WHATEVER she says. I really care about my step-father and I know he's going to get hurt. My mom gets an older men and squeezes the money out of him and moves on to her next victim easily. They've been dating for about 6 months now and she's already discussing marriage. She does not love him but he's madly in love with her! How do I know this? She's still looking for other possible sugar daddies! Should I tell my step-father about my mother's intentions before it's too late? Please, no mean answers. I really need to stop her for ruining men's lives. She's like a SUCCUBUS except instead of sucking the life out of man she sucks all of the money out of her. Catch my drift?