<prompt> Human: Our house is currently paid for. It is about 2300 sqft one story. My oldest daughter will be leaving for college in about a year. I am 47. My father in law is legally blind and will be in need of a place to stay in the coming year or two. He is a great guy, his wife died about 5 months ago, my wife is the only living child, and I have assumed responsibility for managing his finances. He is worth about 900k. My question: Is there really any reason I need to buy a bigger house to accommodate him? If my daughter is leaving for college, he can just have the extra bedroom. His opinion is we need to buy a bigger home with a second bedroom downstairs. I cringe at the added expense as I have worked my ass off to get to the point of having a paid for home. I dont mind being a little cramped vs. having a large 1500 per month payment, added taxes, added insurance. He is fully willing to kick in 100k for the down payment and pay 1500 per month in rent to us for the trouble. I think he can pay the rent, and just live in our extra bedroom vs. having to upgrade our living arrangements. It looks like for my wife and I, we are taking on greater risk and housing expense in order to give him comfort and assurance.  <response>: Put the 100K into an addition or a FIL suite in an out building. 