Re-stating; How can i find multiple children of a child using FindFirstChild?

So my last question I accidentally made it seem like I was trying to do something else.. I am not trying to target multiple children actually. I am trying to target a child of several different children.

local wasTouched = false
local npcScript = game.Workspace:FindFirstChild("PathNPC").NPC:FindFirstChild("Walk")
part.Touched:Connect(function(hit)
    if not wasTouched then
        wasTouched = true
        local humanoid = hit.Parent:FindFirstChild("Humanoid")
        if humanoid then
            npcScript.Disabled = false
        end
        wasTouched = false
    end
end)

This is the script I am trying to fix.

local npcScript = game.Workspace:FindFirstChild("PathNPC").NPC:FindFirstChild("Walk")

This is what I believe to be my error. here I tried to target the script "Walk" but I am not experienced with lua at all.

What am I doing wrong? The script is under Workspace, then PathNPC, then NPC. / Its parent is NPC, NPC's parent is PathNPC, and PathNPC's parent is Workspace.