Thank you Krissy. I have checked with the AKC, GAC and Greyhound Puppies on FB but didn't know about Greyhounds for All and will check with them.
I got two brothers from an Oops litter 10 years ago and they have been absolute angels. Never had an experience with sibling syndrome, but just the opposite. Raising two littermates from their early infancy has proven to be the best scenario as them having each other reinforces their pack mentality. I have heard that sometimes there can be problems, but fortunately, that has not been my experience.