Probably you have a case. It mostly depends on the question if the contract is valid and enforceable. There might be some tricky issues an attorney has to evaluate, for example if the contract should have been in writing and if so, if it nevertheless is enforceable. May be there are other defenses available to the breaching party.
Very generally spoken: yes, even an oral contract can be valid. If so, and if a party breaches, the other party is entitled to damages. Even if the contract was not enforceable or there never was a valid contract, in most cases you would be entitled to "restitution", that means to get back what you gave without getting value in return. Let's assume party A wanted to buy a house from party B and paid $ 50,000. Because of some contract formation issues a court would find that there never was a contract at all. Party B cannot be forced to sell the house to A, but party B has to return the $ 50,000, that would be "restitution." If the court finds there was in fact a valid contract, it might be that party A is entitled to even more: not only their money but also damages. Or may be they can convince the court to order specific performance, that is, to order party B to sell the house.
What we cannot do here is evaluate your case. The forum cannot do this. You need to consult an attorney for that. An attorney might also help you mediate this. May be there is a way to find a solution that will not involve the courts. May be some of the other parties wishes are legitimate and there can be found a way to modify the contract so both parties are happy. I so, an attorney also could help putting it all in writing, which really should be done in a case like this.