Can I use my brothers ex-wife for goods and services?
What kinds of things are you wanting her to do for you?
I plan to use her as a personal secretary and as a cleaning lady.
That is not very nice of you. It is bad to use people for your own ends. You should ask her first if this is something that would interest her instead of just using her for your own personal gain.
No, I'm entitled to this.
You are not entitled to anyone's labor thats like slavery. If you want o have her do these thing you should pay her a fair wage, not a pump and dump.