A person entirely without understanding has no power to make a contract of any kind, but the person is liable for the reasonable value of things furnished to the person necessary for the support of the person or the person's family.
Mont. Code Ann. § 28-2-202
Contracts of persons entirely without understanding
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.