Should I buy my mother in law's house?

[Dimitri Mercier]

My mother in law currently has a tenant she is attempting to evict from her home... I would like to purchase this property. I feel like I could get a great deal on it. ARV ~$170k. Current state I'm guessing $120-130k. This is just North of the Orlando FL area in a city called Altamonte springs. I feel I could get it for about $100k and use some of the equity to fix it up a bit and use the rest of the cash to purchase an investment property.

Good or bad idea.? Biggest concern is this tenant. I'm trying to figure if I should wait and see if she will be able to kick them out or purchase it and do it myself?