This is a continuation of the sex education films by Oswald Kolle. The entire Kolle family appears nude and openly discusses sex among the parents, two daughters and one son. The father recommends masturbation for children unless the act would be traumatic for the participant. Some mention of the Oedipal complex is discussed, but no details are given because individual situations may vary.
Retired tax official Willi Winzig spends his retirement happily and contentedly in his home. However, this changes when his sister Heidelinde, her daughter and his father want to move in with him, and as Willi is a good-natured man, he takes them in, but because they have no money and his pension is not enough for all four of them, he has to take on a new job. He gets a job as a salesman for household appliances, but his good nature gets in the way again.
When the bank clerk Klaus Helwig is arrested on suspicion of embezzlement, his son Heintje, whose mother died at birth, comes to his grumpy grandfather's house. Heintje manages to win his heart and prove his father's innocence..
