Senses
舅爷/ 舅爺 granduncle
one's father's or mother's maternal uncle; grandmother's brother
舅爷/ 舅爺 brother-in-law
one's wife's brother
舅爷/ 舅爺 maternal uncle
a brother of one's mother
舅爷/ 舅爺 master's brother-in-law
honorific used by servants for the maternal uncle or wife's brother of their master