No. Only your U.S. Citizen or LPR Spouse, or U.S. Citizen child over 21, U.S. Citizen Sibling and U.S. Citizen Parent.
Cousins, uncles, aunts, friends or in-laws can not petition anyone for a immigrant visa.
Andre Olivie, Esq.
I would concur with the previous answers. A mother in law cannot petition for the daughter in law. However, if she is a US citizen, then she could petition for your husband, and you would be a derivative beneficiary.