Connections between Scottish and Irish branches of Clan Alexander.

I’m trying to make family trees for every baronet and ran into an issue. According to wappenwiki, the Earls of Caledon, Earls of Stirling, and the Cable-Alexander and Hagart-Alexander baronets are all part of the same clan. The issue is that I don’t see where the connection is between the Scottish (the Earls of Stirling) and Irish (everyone else) branches. Does anyone know what it is so I can draw up a more detailed chart for the Alexander’s?