A brother and sister's constant attempts to outdo each other land them in a sticky situation.

Eight-year-old Mallory feels left out when her older brother, Max, gets a dog that becomes the center of attention.

Kris is jealous of all the attention her twin sister Lindy is getting with her ventriloquist's dummy. When she gets one of her own, weird and evil things begin to happen. Can a dummy be causing all the trouble?

"Family comes first in this magical story of two warring siblings who find the Miffkins, and rediscover their love for each other. Can the Miffkins help this quarrelsome brother and sister find common ground? When Mia and her little brother Jim fall out, they both feel terrible... until the Miffkins turn up. They're small, cute and very mischievous! Can looking after these curious little creatures bring Mia and Jim back together?"--Publisher's description....

More adventures at school and at home with Jake, a first-grader, and his older sister Abigail, known to each other as the Pain and the Great One.

Max Plink's life is complicated. Her parents aren't getting along. The school bullies are relentless, and her own sister is the cruelest of them. Worst of all, her mouth is a mess. With a mismatched puzzle of a jaw, Max has a Class II malocclusion, otherwise known as a severe overbite. She already has braces, which means she lives on Advil and soft foods after each orthodontist appointment. But now Max has to wear painful (and totally awkward) orthodontic...

Revisits the sometimes challenging relationship between a six-year-old (The Pain) and his eight-year-old sister (The Great One) through seven chapters featuring such events as learning to ride a bicycle, having a birthday party, and dog-sitting.