Summoned Entities with Parent

I'm making a boss which initially summons two different "minion" entities. The boss itself doesn't attack, but can still target players. The minions are supposed to target the same entity the boss is targeting, as well as other more advanced actions.

The main thing is, how do I "link" the minions and boss, where each instance of the boss has its own set of minions(in the case that multiple instances of the boss are alive)? Some synced data or NBT tags? UUID magic? 

Probably important to mention I'm using MCreator 2024.4 with Forge 1.20.1 and Procedures+ plugins.