Ruth a lot of my birds are related. in fact, all my mutts are. i started out with 5--all siblings. had 3 hatches from those totaling 20 chicks. all of those were very healthy (although one is missing her nail on her bird fingers). now taht some of those are adults they are breeding with their father/uncle but i dont plan on allowing anymore to hatch. as far as inbreeding goes it will increase homozygosity so this can result in more bad (usually recessive) traits being expressed overtime. by breeding Ruth's two offspring i think you would come out ok though, and in theory the resulting chicks should resemble their grandparents morso than their own parents.