Wifie, at the breakfast table, informs Billie that his mother-in-law, who is an invalid, has been advised by her physician that to regain her health she must visit the seashore. Acting upon the advice, she is soon on her way to pay them a long visit. This news upsets Billie so that he starts to throw plates around the room and tears up the place in a fit of rage. He goes to his office, where he makes it very unpleasant all day long for the clerks. On his return home Wifie informs Billie that mother-in-law is waiting to receive him. He goes to meet her, none too willingly, and tells her that what she needs is strenuous exercise. He at once takes her in hand and starts to give her boxing lessons, much to his delight, as he can maul her about. Later Wifie has an idea and phones for a real boxing instructor who soon has Billie's mother-in-law in tip-top shape. Imagine's Billie's surprise when she invites him to put on the gloves. He does so reluctantly, and after being mauled around the room, he is finally counted out. Mother-in-law then takes the reins of the establishment and rules the household by forcing Billie to pay all bills contracted by his wife.