You are cordially invited

Karla and Egon are getting married, but before they leave for the church, a premarital argument breaks out because Egon does not want Karla's child, Bimmer, at the wedding. Mr. and Mrs. Clausen are also fighting, and Mrs. Clausen ends up not wanting to go to the wedding. Both Karla and Mrs. Clausen lock themselves in their bedrooms. Luckily, expect help is at hand to grant the prospective groom and Mr. Clausen access to their bedrooms.