I have not read this book, but saw it in a list somewhere about 3 years ago, give or take. Family who has genius or academically successful children, except one boy or the boy is different, but I can’t remember in what sense, book might be about this boy and his struggles in the family. Synopsis I read mentioned a sister (of the boy) who is exceedingly successful in school but is strange. Sorry, that’s all. It could possibly be YA but not sure at all. Thanks all
Ordinary Jack?
https://www.goodreads.com/book/show/47812.Ordinary_Jack
That could be a partial description of A Wrinkle in Time, by Madeleine L’Engle. The boy is actually the most gifted and the strangest, and a sister is narrating who is less so, but the family being “special” is central to the plot.
Could it be the Bagthorpe Chroniclrd books?
Can’t totally rule out the possibility of ‘Yolonda’s Genius’ by Carol Fenner.
Is it possible it is “Wonder” by R.J. Palacio?