My mom went to laywer and had an offer of 5k to each to sign over the house so she can sell it. The son never responded and the daughter-in-law said good luck getting me out of this house.
No surprise there. They OWN a house worth more than $100,000. Of course they aren't going to sell it for $10,000.

Quote Quoting Tim suman
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Is there anything my mom can do with out costing a ton of money?
No.

For $100,000 your mom will have to hire a lawyer to file a lawsuit against the two of them for the money.

Unless she recorded a mortgage with the house as security, she has no claim to the house, just an unsecured loan.

A lawsuit will be quite costly as lawyers charge an average of $300 per hour and want a retainer of many thousands to get them started. In case you are wondering, no, it's not likely that any lawyer will take this on contingency because getting a judgment against a pair of deadbeats is no guarantee of ever collecting.

My mom is worried for the unpaid taxes
I don't see why. The taxing authority will put a lien on the house (may already have) and will collect some day if the house ever gets sold.

My mom went to laywer and had an offer of 5k to each to sign over the house so she can sell it. The son never responded and the daughter-in-law said good luck getting me out of this house.
No surprise there. They OWN a house worth more than $100,000. Of course they aren't going to sell it for $10,000.

Though they might reconsider if they both get sued for $100,000 and would let the house go rather than having a judgment hanging over their heads for many years.