Mike is smitten with an attractive model who's been hired to oversee a college fashion show. When he finds out she loves classical guitar music, Mike fakes his way through a song on Robbie's scratchbuilt guitar that he claims he built himself in an attempt to impress her while Robbie cues up a phonograph record outside.
A business trip to Rome does not interest Steve. Since Steve has does not turn down work trips before, the boys try to find out why this is different. Bub tells them it is where Steve and their mother once vacationed.
Steve becomes the tutor for the members of Robbie's wrestling team so they can improve their school grades. When several boys develop a contagious disease, the house becomes quarantined. Bub cannot leave to go fishing and he is upset.
Robbie convinces his current events club committee to have an old fashioned dunking machine booth at the school carnival after Bub comes up with the idea. Meanwhile, some of the other clubs have booths featuring atom smashing, space capsules and computers.
Steve is torn between family life and work. He promised to attend a baseball game in the afternoon, and has a date in the evening. His work called him and told him he is needed to help with engine maintenance.
Bub enters a contest and wins the top prize. He finds out he won $2,000 and the services of a proper butler for two weeks. Bub finds it hard to be pampered by a butler, and the butler finds it hard to adjust to the activity of the Douglas'.
Robbie's economics teacher teaches the value of money and uses the stock exchange as the assignment. Each student gets fictional money to see if they can increase their investment. As Robbie follows the stocks, Steve thinks he has talent.
Robbie tries to get a girl at school to go out with him. She agrees on two conditions: they go to a fighting match and he finds someone to go out with her aunt. Bub has tickets to the sporting match, and he is available for a date.
Steve wants Mike to help him find a date for Sally who works with Steve. Mike has no interest in helping because he thinks he has already found true love. When Mike finds himself helping Sally, he realizes he wants to date her himself.
Mike wants to propose to Sally, but can't seem to find the right words or the right time to do so. After several awkward attempts, Mike isn't sure Sally will accept. Meanwhile, Sally tells Steve she knows Mike is trying to propose, but she won't do the asking. Finally, when the two of them are alone together on a park bench, Mike comes right out and pops the question in a traditional, straightforward manner. Sally accepts immediately and admits she should have done so the first two times he asked.
Steve is asked to entertain the daughter of a visiting Danish couple whose company has an account with his engineering firm. He finds out that the only reason he's being asked is because he's the only single gentleman at the plant who's taller than her. She's quite attractive and so energetic that Steve can't keep up with her. Exhausted, Steve ultimately refuses to go to a costume ball with her. When she reveals that the ball is being held to celebrate her seventeenth birthday, Steve appoints Robbie to go in his place. Robbie gladly agrees.