I'm familiar with the higher numbered multiple hatchings in theory, but I've never heard of any that resulted in viable grubs. Even twins tend to be at least a little undersized, even if the egg is enlarged to compensate.

The primary familial structure is romantic quadrants... four different distinct forms of pair-bond, I guess would be the best way to put it? Although one actually defaults to triads instead.

And beyond that, more nuances of alliance, indirect alliance, and patronage than I really care to list.