Obviously it's not a good idea to breed sons and daughters with parents when crossing any animal, as degeneration and other weaknesses can arise. But what is the real deal there. Currently living outside of the US and I don't have the option to buy a batch of chicks online (or local for that matter) from one breeder and then another batch from another, especially when it comes to rarer breeds. I purchased a set of Silkies and have not seen them anywhere else where I live or anywhere close (and I do get out, doing a lot of chicken projects) I'm assuming that the pair i bought are brother and sister, but am unable to know for sure. They have since grown and produced several healthy chicks and with the passing of time (and the good use of my incubator) I have sold probably 50 of their chicks. I have notkept/ raised any of their chicks and then crossed them with their parents but out of those 50 chicks I'm sure that somewhere somebody is breeding them. I have heard that just with time you will have a weak degenerated chick that kind of just dies for what ever reason (slight cold or what have you) not a resistent animal at all. If i could (and believe me i would, and plan to do so someday) I would buy another female or pair from a different place and sell them as unrelated pairs, but since for the moment that i am not able to do so, what kind of risks are being ran?