The Problim Children by Natalie Lloyd

Seven children with the last name of Problim, live in a swamp on their own while their parents are on an archaeological expedition.  When the kids' bungalow gets destroyed, they go into town hoping to live in their grandfather's house until their parents arrive.  Their next door neighbors in town are the O'Pinion family, and Evil Desdemona O'Pinion is convinced there is a treasure hidden in the Problim mansion.  Even though Desdemona tries to turn the city against them, the other neighbors are intrigued by the strange children, who are totally uncouth in an mysterious and exciting way.

Of course you can tell from the family names that this book is a kind of satire.  It is a comic trial between the good-hearted, but unconventional "Problim Children" and the conventional and critical family that represents public "O'Pinion."  It is not super serious though.  Fart jokes and potty type humor abound. Each of the children have an odd super power and unique quirky personality.  The whole book is a bit of a high spirited romp and I think kids will really like it.  It would appeal to either boy or girl. The story doesn't completely resolve, so if you start this one do so knowing you will have to commit to waiting for the sequel. (285 p. 2018)