My father has a young mistress whom he literally lavishes with expensive tricks.

I've been following her social media page from fake. Shocked that he buys her brand name things, jewelry, etc. All the while saving money for the family. My mom says my dad works hard so I shouldn't ask him for extra things. Aha))))

I think she's not a real virgin (lying to her dad about him being her first) and using him (well that's understandable). She's 21.

I doubt she'd look at him if he was regular. How do I get him to dump her?