We own a Home in Michigan and would like help finding out the laws. Here is my story.

We have someone living in our home that we are wanting to sell. We just found out that this lady has been living there since March of 2004. My husbands "uncle" was watching our house for us and asked us if we where ever thinking about moving back to michigan and we said no. He then asked if we ever thought about renting. We said yea but it would be to much of a hassle since we are in Texas. Come to find out he had rented our house out to someone and we didnt find out till May or june of 2004. He had collected the rent and deposit from her and kept it. My husband decided that he would try it out and she decided not to pay anymore. We had received at 200.00 deposit. And she was behind 2 months then paid 2 months and then got behind again. So we had to have him go through the eviction process but he said she had moved. This was in November when she had "moved". We had talked to one of his dads friends who is interested in buying our house and he had went to look at in May of 2005, and had found out that someone was living there. We come to find out that it was the same lady that was there before. We have no lease, or anything with this lady. She has sent us 2 payments since we have found out she was living there and is still not keeping up on the payments and we have someone who wants to buy the house. How do we go about getting her out since we live in Texas and the house is in Michigan. We cant have his "uncle" do anything since we cheated us out of 5000.00 already and dont trust him anymore. and the person wanting to buy the house doesnt want a tenant. If someone has a way to help or info on where to go to find out what to do would really be helpful. Thank you