Behold Homolka (1970)

This light comedy finds a Czech taxi driver taking his family on a weekend outing in the country. His wife, daughter-in-law, son and two grandchildren are the passengers who disturb the solitude of two young lovers. While the women attend the horse races, the father sits home getting drunk and watching football. The overweight daughter-in-law is upset because she has blown her chances to become a ballerina. All members of the family are caught up in their own individual problems in this realistically portrayed family comedy.
~ Dan Pavlides, All Movie Guide