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As Christmas approaches, Caroline Malloy continues the feud between her sisters and the Hatford brothers by making Wally Hatford be her partner for a special project at school.

The Hartford brothers cannot imagine spending Thanksgiving dinner with the Malloy sisters as the practical jokes and rivalries between the two families continue.

Disgusted that a family with three girls moves into the house across the river, nine-year-old Wally and his three brothers declare a practical joke war on the girls.

Despite a New Year's resolution to be nice to their neighbors the Malloy girls, the Hatford boys find themselves continuing their rivalry and war of practical jokes.

Explains what brothers and sisters are, different kinds of siblings, and the relationships that they have with each other.