If your name is on the deed, you are part owner of the property.
This answer is for general education purposes only. It neither creates an attorney-client relationship nor provides legal guidance or advice. The answer is based on the limited information provided and the answer might be different had additional information been provided. You should consult an attorney.
I agree that if you are the deed you are a part owner. One option you have is to bring a partition action which essentially would force a sale of the property and division of proceeds.
You are not only an owner in law because your name is on the deed, you may also have an equitable interest if you have been making payments and taking care of the place. I don't know who "they" are, but it hardly matters. Call for a consultation with a real estate lawyer if issues have arisen related to ownership.
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