Maybe next time just try out things at first? i.e. rent, move the family into the rented home after 2-3 months without selling the original house for some time.
It's not an advice but things to bring on to discuss why they did the otherwise.
Yeah, my wife would agree. ;) This is probably the most epic failure of my career. I thought I did proper due diligence but obviously I didn't. A learning experience for sure.