The Trifonov family lives in a small town. Vladimir, Nadezhda and their two sons Romka and Pashka. Once Pashka with a group of factory workers goes to Moscow on an excursion. After his return, the parents notice that the son has become more withdrawn, taciturn, often absent somewhere. The parents soon find out that the son is dating a woman fifteen years older than him. And the chosen one also has three children. Parents begin to fight for their son, crushing and breaking the newly born love. But, after a while, both realize what a terrible mistake they made.