1) Your parents cannot force a joint owner to remove themselves off the deed. The only option they have to separate the relationship would be to sue to force the sale of the entire property, which means to buy her out of her ownership. I doubt your parents would be able to do this.
The other option would be to sue your sister to enforce the agreement that she would be responsible for the taxes.
2) A property is not considered abandoned unless the owner specifically says they are abandoning the property or your parents obtain an adverse claim to her property. In California in order to claim adverse possession, your parents would have to adversely possess your sister's home for 15 years and then file a claim for adverse possession.
Options to consider:
1) Your parents buy out your sister's interest to the property in exchange to sign her name off the deed.
2) They obtain authorization from your sister in writing to permit them to lease her property.
3) Last option is to sue as stated in the beginning of my answer.
Please click accept, it is greatly appreciated. To request me for future questions, please begin your question with “AttentionCustomerrdquo; Thank you.
Please Note: JustAnswer.com is a public forum. JustAnswer.com is not a law firm. JustAnswer.com is only a question and answer site. Asking a question does not create an attorney-client relationship nor is your question protected under the attorney-client privilege. An attorney-client relationship is established when you enter into written contract for representation and pay a retainer directly with the attorney or attorney’s firm.
JustAnswer.com uses the term “Expert”. I do not hold myself as an expert when I answer your questions. The information given by me is not legal advice. I am not establishing an attorney-client relationship with you. I am providing only research, resources and information only for you to be informed and educated about your particular needs and my answer is limited to the facts presented. You are only paying me for such information given.
My answer or reply is limited to your facts presented and additional information you post may not come in after my reply or answer has posted, if this has occurred please let me know and I will answer further. Due to site tech reasons, oftentimes I am initially only able to see the first part of your post, so this may result in more interactions between us. There might also be a delay in my reply or answers, as I may be helping other customers, or called away from my office or have logged off. Please be assured your question(s) will be answered promptly.