Could multiple cecaelia fertilize the same egg clutch?
It is possible, but it's not commonly done. That's because the eggs are contained in a delicate membrane that the male cecaelia must pierce with his tentacle to inject spermatophores. If this isn't done carefully, the membrane ruptures and the eggs will die from exposure to the elements.
Piercing the membrane once is already risky, piercing it twice or more is just asking for trouble. The structural integrity of the membrane becomes weaker each time.
Under lab conditions, I think it's totally possible to inject the same egg clutch with the spermatophores of multiple cecaelia and end up with half-sibling children. But in natural conditions, this usually ends in tragedy.
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