Showing my age here but...
I fucking LOVE this game, I know Canon wise it's a side story to the Algol Saga at best but I wore my Genesis out playing this game.
The generational aspect of it was ahead of it's time, especially when a future generation would reveal secret stuff that happened a generation prior
For instance, Lyle, your friend and Party member from the first generation was revealed in the second generation to be responsible for kidnapping Maia, Rhys' bride, and setting all the events of the game in motion.
Epic quests for Legendary Weapons to defeat Dark Force, 3 generations equaling 8 different endings and still play it at least once a year via emulation.
Phantasy Star 4 is the clear best of the series and the perfect ending but I'll always love 3 equally.