How to get the old GUI size to tween, to avoid warps in size when minimizing?

I am trying to make a GUI where it loads, and then shapes to a larger GUI, that works. However, I cannot get it to read its own current size to make sure that the frames maintain the original shape. Here's my code that isn't working:

local open = true
script.Parent.MouseButton1Click:Connect(function()
	if open == true then --closing function
		local Frame = game.Players.LocalPlayer.PlayerGui.Exoteric.MainTitleFrame
		local Frame2 = game.Players.LocalPlayer.PlayerGui.Exoteric.Main
		local size1 = Frame.Size
		local size2 = Frame2.Size
		local s1 = size1
		local s2 = size2
		Frame2:TweenSizeAndPosition(UDim2.new(s1), UDim2.new(0.3, 0,0.953, 0))
		Frame:TweenSizeAndPosition(UDim2.new(s2), UDim2.new(0.3, 0,0.953, 0))
		open = false
		script.Parent.Text = "?"
	elseif open == false then
		local Frame = game.Players.LocalPlayer.PlayerGui.Exoteric.MainTitleFrame
		local Frame2 = game.Players.LocalPlayer.PlayerGui.Exoteric.Main
		local size1 = Frame.Size
		local size2 = Frame2.Size
		local s1 = size1
		local s2 = size1
		Frame2:TweenSizeAndPosition(UDim2.new(s2), UDim2.new(0.3, 0,0.307, 0))
		Frame:TweenSizeAndPosition(UDim2.new(s1), UDim2.new(0.3, 0,0.307, 0))
		open = true
		script.Parent.Text = "-"
	end
end)