The legal owner of the house may very well be your mother's estate. You don't say if there is a Will or a Trust, who is currently on title, etc. ...

An attorney can assist with all of these things. If the land is valued at less than $184,500, a full probate can be avoided. Best of luck.

Have an attorney write him a letter explaining to him that he broke the law and if you have to sue him, it will be very expensive and encourage him...

If it is not signed, it is valid. You don’t say want document you have “notarized”. That may be valid depending on what it is.

I believe you asked this question already. You have a signed contract that is binding and it appears the seller is trying to unilaterally change...

Sign nothing. Have an attorney review the facts. You can probably learn a lot during a free consultation. You have rights.

Call a couple of attorneys, and discuss your concerns and the best way to move forward. Be prepared to email the attorney a copy of the Trust.

If she has more than $184,500 at the time of her death, probate will be required and notice to her family in Mexico will be necessary. If it is...

It sounds like they may be, but it is difficult to follow your post. In any event, an attorney is likely necessary so use the Find a Lawyer tab...

You answered your own question. You don't trust him so don't sign the waiver of bond. In addition, you may want to consider options of keeping...