I'm going to kick out my 25yo (26yo next month) son and his girlfriend
Why would you kick both of them out?
He needs to learn how to be independent.
It is fine not wanting your adult child clinging on to you and living at home. Kicking him out my be tough, but tough love is sometimes needed to get a loved one back on the right track.
I tried talking to him (her) many times, they both just don't listen. He (she) needs to learn to be independent and he needs learn to be a man. What kind of girlfriend is that?
Sometimes people just never want to grow up and be on their own, but it's important that they become independent eventually.