Warren and Helen have barely unpacked their trunks when they are "afflicted" with Warren's brother Oscar, his wife and their mischievous kid. Many amusing complications arise when Know-it-all Oscar all but puts the house out of commission. He boasts of his skill as an electrician, with the result that all the fuses are blown out; his plumbing skill is no better, and he mixes up the pipes so that water comes through the stove and gas through the bath tub, and finally makes a wreck of the roof when trying to shingle it. At last, Oscar decides to leave and Helen and Warren sigh with relief, when, to their consternation, Helen's brother arrives with his family.