As a script under the part that will serve as your button

local button = script.Parent

local house = game.Workspace.BasicFamilyHome --Update name if using different house

local function burn(otherPart)

local partParent = otherPart.Parent

local humanoid = partParent:FindFirstChildWhichIsA("Humanoid") --Checks if player touches not some other part

if ( humanoid ) then

for num, child in pairs(house:GetChildren())do --Goes through house model and looks for parts

if child:IsA('Part') then

local alreadyBurning = child:FindFirstChildWhichIsA("Fire") --Checks if part already has fire

if not alreadyBurning then

local fire = Instance.new('Fire') --Adds fire to part

fire.Parent = child

fire.Size = 20 --Can be between 2 and 30

end

end

end

end

end

button.Touched:Connect(burn) --Triggers function when part is touched

local button = script.Parent

local house = game.Workspace.BasicFamilyHome --Update name if using different house

local function burn(otherPart)

for num, child in pairs(house:GetChildren())do --Goes through house model and looks for parts

if child:IsA('Part') then

local alreadyBurning = child:FindFirstChildWhichIsA("Fire") --Checks if part already has fire

if not alreadyBurning then

local fire = Instance.new('Fire') --Adds fire to part

fire.Parent = child

fire.Size = 20 --Can be between 2 and 30

end

end

end

end

while true do

random_timer = math.random(10,30) -- Random number

wait(random_timer) -- Waits for random number

burn() -- House catches on fire

end