I'm looking for actual genuine responses, not half-assed retorts like 'lol idk'.

So, this has become something of a simple curiousity for me. It hasn't been eating at me but it's just something I started thinking about yesterday when I was playing as my Techer Cast in PSO2, because I like to come up with backgrounds for my characters sometimes.


How exactly are CASTs made (now)? Who creates them, and what sort of processes would that involve?
Also, for lack of a better question... Do CASTs have parents? CAN they even have relations? o.o