Fudge -A- Mania by Judy Blume

Peter Hatcher can’t catch a break. His little brother, Fudge—the five-year-old human hurricane—has big plans to marry Peter’s sworn enemy, Sheila Tubman. That alone would be enough to ruin Peter’s summer, but now his parents have decided to rent a summer home next door to Sheila the Cootie Queen’s house. Peter will be trapped with Fudge and Sheila for three whole weeks!