congrats to B00, but I just suspect her experience isn't entiely relevant for cockroach's purposes: big gaps like that create an entirely different family dynamic from a 5-year one. As for why they wouldn't love each other... well, there are always issues between siblings, though they needn't be traumatic: the first one loses that undivided attention, the second one never gets it at all. And for no special reason, some siblings just don't get on. (Just as some parents, however hard they try to be equally loving, actually like one child more than another.) Sorry, cockroach, not trying to scare you. If you want a second one, and it seems that you do, go for it.