A husband and wife cannot by any contract with each other alter their legal relation, except as to property and except that they may agree, in writing, to an immediate separation and may make provision for the support of either of them and of their children during such separation.
Mont. Code Ann. § 40-2-303
Alteration of legal relation by contract -- separation agreement
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.