From the sequel: the city and country girls have to work together to prevent Isabel from signing the farm over to the uncle without letting on that the Disappeared Dad may be alive before proof is in hand. It's not the Bavarian Fire Drill that follows (with the city girl going Eek, a Mouse!! like crazy), it's the city girl trying to instruct the country girl's next move while still screaming.
The following exchange in the first movie, between Selma Quickly and her friend.
Mrs. Quickly: "...What do you take me for, some common-" *cut off as she hears a knock at the door*
I know what he wanted, and it wasn't marriage! No wonder there are so many of you.
The children manage to keep their Great Aunt Adelaide from taking one of them by passing off the scullery maid, Evangeline, as one of their siblings, so she could be raised and given an education and the actual siblings wouldn't be broken up. At the end of the movie, Mr. Brown and Evangeline finally admit their love for each other and agree to marry. In the midst of the congratulations, Great Aunt Adelaide gives a horrified cry of "Incest!" This then leads to Mr. Brown having to explain to the priest that no, Evangeline is not actually his daughter.