To expand on that a bit. I use a purple band (right leg) on Joannie my OG F0. Her progeny F1 I'll band Purple/other color on left leg. F2 grandbabies I go back to right leg with purple/other but try to switch 2nd color so that they're not the same as F2s. Haven't gone further yet to get confused but I've only lost one main band on one of the boys since starting just recently in fact but there's 4 white (Raven) and 2 yellow (momma) so process of elimination worked.
That was easy to figure out just by noticing a single odd band and process of elimination (color head count)
If anyone has suggestions or a different easier way I'm open to ideas. But this has worked so far. Of course, I keep records of all my birds also so it's a quick look to see who's who also.