Short of convincing the other parties that it is in their best interests to sell, a partition action would be necessary. You would need to weigh the cost of this suit against the benefit anticipated from either getting the 1/3 that you and your sister own carved out into a separate tract; if the property cannot be fairly divided, then against a 1/3 share of proceeds from the sale of the entire parcel. If you want more information about partition, you should contact an competent Texas attorney who practices real estate law.
The above comments are made by an attorney at The Rieck Law Firm (RLF). RLF offers free initial consultation to potential clients and more information about this firm can be found at www.riecklawfirm.com.
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Thank you for your question. I agree with the previous response. I would strongly recommend having an attorney review the deed and related agreements concerning the ownership of the land in order to properly advise you on the best course of action based upon your goals.