Can a job offer be withdrawn unilaterally? After an expensive, complicated relocation?

My husband was offered a position with a privately held company in North VA. As a result, we sold our previous home, I quit my job, and we all relocated from the West Coast with our family and pets, and swiftly started our home search. We put in an offer for a new home yesterday. Today, he went in for his first day at the new job, and was invited to sign an employment agreement before starting. After carefully reviewing, he noticed and marked on his copy some issues:

- Fixed several spelling and paragraph indexing errors
- Reminded them that the offer included health care for the entire family (The agreement only included employee only healthcare)

His future manager invited him to leave for the day while the company attorney reviewed his proposed changes. At diner tonight, he received an email stating that the offer had been withdrawn, because he changed an agreed upon contract.

Consider that:

- There was a written offer letter that had been agreed upon, and all he did was annex that offer letter to the employment agreement, resolving the inconsistency between the healthcare obligations.
- We incurred massive expenses and disruptions in supporting my husband's new employer
- All previous communication, including the offer and my husband's acceptance had been in writing (email)
- The agreement included a relocation package, which was only valid if the employment lasted for a period of time (I think it was 6 months).

Now we are left on the East Coast with our belongings in transit, no jobs for either one of us, outside of our professional network, no home to return to, and two small children and pets in tow. And since we are not independently wealthy, should our offer on the home be accepted, we face the possibility of being out of a substantial good-faith deposit on that house, since the financing will not actually go through.

Any way this could be redressed? What are the obligations of an employer who enticed someone to relocate, but essentially bails on the offer on the first day?

Note that nothing my husband marked on the agreement was substantially different than was written (he essentially fixed some spelling errors), other than the one item on health insurance, which the company had changed from the offer.

Any suggestions?