Board Thread:Theories and Speculation/@comment-28939725-20180103103451/@comment-1512913-20180104183411

It seems that in the Otsutsuki Clan, once a male has a son, he simply gets degraded into a food source for him. I wonder if the same is true for father-daughter, mother-son/daughter.

If so, then it means that it's a standard for Otsutsuki to absorb their parent/parents.

It's their way of assuring that certain traits don't disappear between generations, probably.