I have a pair of siblings that I'm using to prove out a dinker project. I've breed them together 3 times, for a total of 11 eggs and no issues. Most animals can be inbreed for several generations without issues. Even well breed and registered animals like horses, dogs, cats, etc, have a guideline for allowable generation inbreeding. There have been studies done on breeding mice siblings for generations and it took a ridiculous amount of inbreeding before there were defects. People blow inbreeding issues way out of proportion. Just think about any animal in the wild, it's pretty darn likely they are going to breed with family members. Nature took that into consideration.
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