wills is a form of:

Brother-in-law



noun — Plural: Brothers-in-law
1.
(the brother of one's husband or wife, the husband of one's sister, the husband of the sister of one's wife or husband) បងថ្លៃឬប្អូនថ្លៃប្រុស
ENGLISH MEANING
noun — Plural: Brothers-in-law
1.
The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister.