Is Will's son biological or stepson? What do the books say?
Do you mean Wally? In the show he’s obviously a step son, I mean…He’s twelve. Will has been married for three years besides it is stated he’s a stepson. In the books it’s different but the show and the book are different universes, so no one in the fandom mixes them up nor is it logical to do so since book Hannigram doesn’t actually exist.