I found a letter at the government CMS site, dated 2011, that gives official and specific details regarding the transfer of real estate and property liens and estate recovery intended to recoup Medicaid payments for long term care.
It is full of good and current information but the following paragraph is important to many of the members of this forum who have moved in with their parent(s) to be caregivers and have no other home of their own:
"Per section 1917(b)(2) of the Act, Medicaid estate recovery may be made only when there is no surviving spouse (subject to the provisions in DOMA) and when there is no surviving child under age 21, or blind or disabled child of any age.
When estate recovery occurs pursuant to a lien, protections are afforded for siblings still lawfully residing in the home, as well as for sons or daughters who provided care to the parents and who continue to lawfully reside in the home."
I know you have to be able to prove that you lived there for, I (think) at least 2 years prior to applying for Medicaid long term care and that the care you provided kept your elder out of the nursing home for that time.
Hope this helps!