AncestryChanged (Event)

AncestryChanged ( Instance child, Instance parent )
Description	Fired after the child changes.
Member of:	Instance

Example

local p = Instance.new("Part")
p.Parent = game.Workspace
local function ancestChange()
  print("Ancestry changed")
end
p.AncestryChanged:connect(ancestChange)
p.Parent = game.Lighting --fires event