Can I be evicted from my rental home of five yrs because current owner wants to give the property to a family member

My wife and I have been renting a home For 5 yrs. a couple of weeks ago the landlord of the home informed my wife that his daughter sold her house and he is giving her the home we live in. He did this verbally with a 45 day verbal to vacate property. This time last yr my wife and I were approached by the current owner asking if we interested in buying the property. We did say absolutely yes. Now all of sudden we have a 45 day verbal to leave. We have two young children and love the area and school district. The home is not perfect but we have made it our home. We are in such disbelief of this notice short notice after living in times of complete uncertainty for over a yr and half with the global pandemic.