If Paragraph B (2) is checked then it does become exclusive and irrevocable but can still be cancelled unless C(2) is checked also.

This is an irrevocable trust with gift tax implications.Qualified Personal Residence Trust - A qualified personal residence trust (QPRT) involves the transfer of a personal residence to a trust with the grantor retaining a qualified term interest.

All contracts, options, or other devices not based upon a substantial consideration, or that are otherwise employed to permit an unlicensed person to sell, lease, or let real estate, the beneficial title to which has not, in good faith, passed to such party for a substantial consideration, are hereby declared void and ineffective in all cases, suits, or proceedings had or taken under this chapter; however, this section shall not apply to irrevocable gifts, to unconditional contracts to purchase, or to options based upon a substantial consideration actually paid and not subject to any agreements to return or right of return reserved. 

The seller has filed with DBPR but it could take months to determine if they were brokering without a licensed. 475.43 states:"All contracts, options, or other devices not based upon a substantial consideration, or that are otherwise employed to permit an unlicensed person to sell, lease, or let real estate, the beneficial title to which has not, in good faith, passed to such party for a substantial consideration, are hereby declared void and ineffective in all cases, suits, or proceedings had or taken under this chapter; however, this section shall not apply to irrevocable gifts, to unconditional contracts to purchase, or to options based upon a substantial consideration actually paid and not subject to any agreements to return or right of return reserved."

There are ways for asset protection that includes a trust (revocable or irrevocable) with a LLC.

All contracts, options, or other devices not based upon a substantial consideration, or that are otherwise employed to permit an unlicensed person to sell, lease, or let real estate, the beneficial title to which has not, in good faith, passed to such party for a substantial consideration, are hereby declared void and ineffective in all cases, suits, or proceedings had or taken under this chapter; however, this section shall not apply to irrevocable gifts, to unconditional contracts to purchase, or to options based upon a substantial consideration actually paid and not subject to any agreements to return or right of return reserved.Then you have 475.42 which states brokering without a license is a 3rd degree felony:475.42 Violations and penalties.—(1) VIOLATIONS.— (a) A person may not operate as a broker or sales associate without being the holder of a valid and current active license therefor.

Talk to an attorney about your grandmother getting an irrevocable trust to protect her assets. 

Friends, Can anyone recommend a lendor willing to work with an irrevocable trust for a primary home in Texas?

Separately, my mother has an irrevocable trust for which I am the trustee.

In a situation like this, the reverse exchange provides plenty of recourse with its irrevocable option to purchase, NNN lease and promissory note/mortgages.I'll take care of it personally for you David.