I want to make a Tree Growing script that works, could anyone help me with this script?

Hello, my current tree growing script (shown below) makes all the children of the Model (all of the tree's parts, like branches, etc) grow as well.

I have also made an inner part of the tree for decoration. I have succeeded at the growing bit so far, however, I have no idea how to make them scale/position correctly so that branches grow off the tree and not into it.
I have tried the Weld tool, but it doesn't seem to work. In other words, my problem is:

The branches grow into each other, and I only want them to grow off each other. Here is a GIF of the issue

As you can probably see, it grows into a mess.

Here is my script (it is a child of the tree model):

local Max = 100 -- Max Size of tree
local Speed = 1 -- Speed of which it grows

while wait(Speed * 2) do
for name, TreePart in pairs(script.Parent:GetChildren()) do
    if TreePart:IsA("Part") then -- Checking if it's a part -- Finds tree Parts to make them grow
     print("Found "..TreePart.Name)

      if TreePart.Name == "Branch" or "InnerPart" then
	local Tree = TreePart
	local X = Tree.Size.X + (Speed/10)
	local Y = Tree.Size.Y + Speed       -- The amount tree grows
	local Z = Tree.Size.Z + (Speed/10)

	if Y < Max then      -- Grow tree if hasn't rached max size
	Tree.Size = Vector3.new(X,Y,Z)

	if TreePart.Name == "Branch" or "InnerPart" then
	local X2 = Tree.Position.X + (Speed/10)	         -- ERROR IS HERE
	local Y2 = Tree.Position.Y + Speed/2		 -- ERROR IS HERE
	local Z2 = Tree.Position.Z + (Speed/10)		 -- ERROR IS HERE
	Tree.Position = Vector3.new(X2, Y2, Z2)	 -- ERROR IS HERE

	else
	print("Not growing anymore")	

	end
	end
	end
	end
	end
end

Does anyone know how I could correctly position the branches? Thank you. ????

I have fixed it! I just had to make all of the Tree Parts into a Union. Had to edit the script a bit, but it works!