婿 almost never stands alone. It lives in compounds:
女婿 (nǚxù, son-in-law / daughter's husband),
妹婿 (mèixù, younger sister's husband),
翁婿 (wēngxù, father-in-law and son-in-law),
郎婿 (lángxù, husband, literary). The
女 radical signals "family / marriage" relations.
