Re:SPOILER ALERT!!! (Score 1)

Indbreeding only has adverse effects if the family in question possesses recessive genes for said effects. Normally, those genes would not manifest themselves in the offspring's phenotype because breeding with someone from another family (assuming they do not possess that same gene) will keep that gene recessive. Inbreeding, however, would significantly increase the chance that that gene would surface in the offspring phenotype, as both parents would possess that recessive gene.

If, however, the Oberon's crew did not possess any recessive genes with "negative" effects, indbreeding would not be harmful in any way. eventually, the species would diversify as its numbers grew due to standard genetic mutations, but it would not suffer any of the deformations etc. that we, as a society, attribute to/associate with inbreeding.
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