How do I detect a child object that is within another child object?

All day I have been trying to fix this script, yet no success. My goal is to have the script detect an object within a Player's character and then act accordingly to said character being killed. The main issue seems to be detecting the object within the character. There are probably multiple reasons to why this script is not working, but I am not skilled enough yet to know what they may be.

The code:

dft = {}


function GetPlayers()
local c = game.Players:GetPlayers()
for i = 1, #c do 
table.insert(dft, c[i].Name) 
end 
end



local EnemyGUI = game.StarterGui:FindFirstChild("Enemy")

local Draw = game.StarterGui:FindFirstChild("All Losers")


function PresidentDeath()
    local thing = game.Players:FindFirstChild(dft["Character"]).President
    local president = thing.Parent
        president.Humanoid.Died:connect(function()
            local Humanoid = president:WaitForChild("Humanoid")
            if president.Humanoid:FindFirstChild("creator") ~= nil then -- If Humanoid was killed by another Player
                local Killer = Humanoid.creator.Value
                if Killer.TeamColor ~= president.Player.TeamColor or president.Humanoid.Health == 0   then
                    for i,v in pairs(game.Players:GetPlayers()) do
                        v.PlayerGui.Enemy.Frame.Visible = true
                    print("worked once")
                    end
                end
                end
            end)
    end 
while true do
wait(3)
PresidentDeath()
end