Ghlover, I expect there will be others on the site coming forward with more expansive responses but in essence, I think you are with your circumstances, going to find it very difficult to realise the full potential of any pup(s) you purchase and you are likely to strike problems. Can you depend on the family member to continue to provide that necessary 3rd feed a day, what is the pup going to be doing during the day when you and your wife are at work and maybe there is good reason for there to be 2 pups not one, are you worried about your backyard being destroyed, is your backyard completely secure whilst you are at work and is the park across the road really suitable for providing your pup(s) with the all important galloping. For more reasons than one I doubt the latter point very much. Many decades ago what you are contemplating may have been feasible and many would have done it but with modern day regulations and the propensity of the public to complain to authorities, particularly where a greyhound is involved, I do feel pessimistic about your proposal. Sorry, it sounds in many ways, a lot of fun to me but I am not optimistic about success nor the absensce of major problems, maybe even divorce is your wife was not "fully on board". Whatever you do I really hope it works very well.