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you are more related to your brother and sister then you are your father or mother,does that confuse you ?
as a pigeon breeder for over 50 years,i don't think twice about a brother and sister mateing or a fatherXdaughter or motherXson mateing.
the idea is to breed for qualities that you want in your live stock and once you have it,you want to stay in the same family,,auntsXnephews and uncleXnieces.
every time you out cross to another family ,you expand the gene pool and you are back where you started,with crap,unless you are after something in the new family that brings some thing special in to the breeding.
Larry