I loved the original games and will still play GoW 3 from time to time.
So I think that the best thing would be to remake GoW 1 + 2 with the control improvements from the PS3 ports and shiny new graphics (that would make a good cross gen candidate).
Now I'm replaying 2018 and I think it starts too slow in some ways, especially compared to 1, 2 and 3, where you get a good amount of heavy action before you get exposed to the story, but I get that may not work with the damn kid.