This is not a facetious answer. Are the family members familiar with the smell of cooking cabbage, eggs, liver & onions, fish sauce, greens, pickling brine, curry, or other strong smelling foods? Do the complainants enjoy craft beer?
To be fair a fair amount of yucky compounds boil off during wort boiling.
Only help I can offer is putting a fan in the window and shutting off the kitchen if the hood isn’t doing the trick.
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