While I do not practice in NY State I would suggest you contact a NY lawyer to discuss what is probably known in that jurisdiction as a partition action. This type of action can be used to force the sale of the house or require them to buy you out. Good Luck.
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I agree with the prior commentator that legal action may be required (and hopefully is available) to resolve a dispute among co-owners as to the disposition of property. It would help if there were some writing (deed of gift, will, memorandum written at the time of gift) to indicate your mother's intent as to the disposition of the property.
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I agree with the answers already posted here. In NJ you would be entitled to file an action called a "partition", which is basically a forced sale in most circumstances. In NY things may be different. You should consult a NY based Real Estate attorney. Good luck
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You must contact a New York attorney to help you with this. My guess is, as another attorney pointed out to you, that you may be able to force a sale of the property. Good luck.
Without meeting with you, and knowing all the facts and circumstances of your case, my opinion is not to be construed as legal advice, just general educational information.