If his hair is representing cultural beliefs then discuss it with the mother before cutting it, other than that it's a father and son bonding moment taking him to the barbershop and introducing him to barbershop culture.
I have locs I go to the shop to get my beard lined and my son gets his hair cut. He get his hair cut how he wants, giving him that freedom to decide if he wants a fade, Mohawk, designs or what ever.
He's 8 I'd rather him get to know different styles and see what he likes now before he's 16 experimenting and fuck rine and have purple plats lol wtf