Signed a contract but seller is passed away

[Luba T.]

Need some advice on how to proceed with the situation:

We signed our part of the contract to buy a property, give 10% earnest money, but the owner is passed away without signing his part of the contract. Now, after 3 month, the seller's family telling us that other prospective buyers offering more and want us to raise a price.

Any ideas how to handle this situation?

Thank you.