Spoiler
Pete figured it out himself at the end/last chapter of the main story of the novel lmao. Snippets of their children start at the side stories, which is not a lot but their children show up at chapter 52 and 78 in Kiss me Liar. They also mentioned their 3rd child (daughter) there but was not mentioned in the novels
Spoiler (I answered a different thing lmao)
Lmao I answered when Pete found out Chase is his dad my bad lol.
They go on a family outing at the theme park (basically rented out the entire thing lmao). An incident with a dog happens with Chase and Pete aka trauma activated. Then Josh tells Chase after that.

Can the one who read the novel spoil me when chase gonna know when he going to tell chase he is the fatherr