draw up a contract.
you will buy the home, but not the furniture. and if thats going to happen...
make sure the home is move-in ready. so there won't be continued intervention by you because of repairs. make sure its a realistic home that they can furnish and upkeep. giving 2 people a 6/7 bedroom home with multiple bathrooms and rec rooms might pressure them to furnish it with money they don't necessarily have. 3 acres might be a problem if they aren't going to want to hire someone to keep up the property.