All the ways home by Elsie Chapman.

All the ways home by Elsie Chapman.Feiwel and Friends 2019. 

A story of family and home, and redemption. 

The book doesn't really deal with Kaede's grief, but it is obvious he expresses it through anger and violence.

His visit to Japan, and reconnecting with his half-brother, through the vehicle of a school assignment, helps him define what home means to him. 

Although grief is not explicitly stated, it is present in Kaede, and in his brother, Shoma. Not just the recent death of Kaede's mother, but also the absence of their father, the break-up of their family, and the what-could-have-beens. There is also Kaede's reject other his grief-fuelled actions (not all of them). 

I do wonder about their father's absence and lack of technological coverage, as internet and cell phone coverage isn't that bad. But, for adding to the plot, it seems necessary.