@Patrick Meade hey Patrick, sorry to hear about this unfortunate situation. Disclaimer: I am not an attorney, and I'm half asleep but my addiction to BiggerPockets is forcing me to respond. Please excuse any typos and bad grammar as I'm typing this response from one thumb and half closed eyes.
It sounds like this may end up having to be handled in court in which case that will probably take a significant amount of time and the current buyer for your home may not want to, or be able to, stick around for that long until this gets figured out. If that's the case, in addition to asking for reimbursement of your attorney's expenses, calculate the holding costs of how much it costs you daily to live in your existing home (holding costs) and keep track of how many days it has been since the original scheduled closed date and make sure to include reimbursement for those days in the suit as well. In addition, you can also sue for emotional damages due the the stress this has caused you and you family for not being able to move into the new home you desire to be in, in the time frame you desire. I hope this helps and I hope things work out for you!