<human>: Condense the text into a few key points

Me: age 28m.

Dad: 61m

His daughter: ~10

His gf: ~mid 50's

**Backstory**

1. I Lived with my dad and his girlfriend at his home until about five years ago. Over time it had become apparent she suffered from some mental issues which she took out on me, my extended family, even my pets. Eventually I moved out and got on with my life. I think the gf has at this point lived with my dad for ~15 years.

2. My dad made the mistake of having a child with this woman and feels he is financially incapable of entering a child custody battle or risk losing all contact with her (the child). So this girlfriend still currently lives at his house with him.

3. I still maintain a good relationship with my dad, although his girlfriend has made things difficult even with me out of the house.

4. He owns a few small rental properties which have been underwater and he essentially lost his job recently. He's had trouble recovering financially and can't afford to pay for some essential property repairs. I don't blame him for this and want to help.

5. I'm finishing college, hopefully making enough money to help him through this tough spot as I start my career.

**Q:** 
My dad wants me to help him pay for property repairs on his properties. Unfortunately his girlfriend with mental issues (and consequently a terrible person) still lives with him in one of the properties he owns. Before I pay for any repairs I want him to kick his girlfriend out of the house first. Am I justified in this request, or am I being a bit too extreme? 

I am concerned about my half-sister, but at the same time his crazy gf  uses the kid to manipulate him. The gf really needs to go, not just for my sake, but my dad's.
<bot>: Dad lives with his crazy gf, wants me to pay for his property repairs. I want him to kick her out before I help. Too much to ask?