Mouse.Target & Descendants ~ part pathing question

So lets say mouse.target is pathed like

folder → aaa → bbb → ccc → targetpart

I want to grab the immediate child of “folder” along the part’s path so in this case ~ it would be the “aaa”. I’ve included my code below, but I’m unsure of how to or if there even is a way to do what I’m asking.

local folder = game.Workspace.Vehicles


tool.Activated:Connect(function()
	local player = Players.LocalPlayer
	local mouse = player:GetMouse()
	if mouse.Target:IsDescendantOf(folder) then
		--tool.Place:FireServer(mouse.Target) 
	end
end)