oh I'd be livid

haha id make fun of her for bein with someone twice their age... have fun with it

I remember when my mom was dating a guy younger than my older brother. It was just weird.

Wow, I'm sorry for you, your mom, your dad, and your "mom".

Does she make your father happy? If she does, perhaps you should come to terms with it. You still don't need to call her 'Mom' though.

OP, your dad is a creeper

IMO your dad is entitled to find love where he may - it's not always something we have a choice over. She might be after him for his money and he may be blinded by prospect of a piece that's a generation younger than him but we don't know that at all. They may simply be in love. It happens. However, whatever the background, you are entitled to object to you new "mom" patronising you in the way that she seems to be. You should be free to raise it with her. If you aren't comfortable with that then raise it with your dad. You can't ask him not to be with his wife, but you can point out that it's demeaning to call a younger person "mom" or to be treated as a child by her. Evidently you are both adults and should behave as such. Your dad must have thought about these issues and can't be surprised that you have concerns. I would try to keep your shopping date, but make sure that you make your own purchases and if possible it's you who pays for lunch etc. If you want to establish your status as this woman's equal then you have to behave like that. If you accept her financial support then you are accepting her seniority over you. Once that happens it will be very hard to reverse. Good luck - and FYL.

that sucks!

whoa.

Hopefully they're not living in the same house, if she's 3 years older then the wife, I would hope that the op is AT LEAST 25 or so and living on their own (or getting close to moving out)