These days, with photocopiers, digital cameras, scanners, and all manner of gadgets, I think it would make sense to copy all the family information, make hard and soft copies, and then send the actual book to the person who seems most interested and capable of caring for it, or, preferably, a library/archive if they are interested. There is no reason why everyone can't have their own copies these days. To care for an original is a responsibility, and needs to go to the person/organization best equipped to do so. Personally I have no need for originals of anything except photos, as long as the copy is clear.
(But I sure would like to find the family bible owned by Adam Murray, who was born in Castleton Scotland in 1808 and died in 1900 in Chicago, apparently at the home of his son Charles!) It is mentioned in the History of Middlex County (Ontario), so we know it did exist. -- just thought I'd throw that in here in the vain hope that some day someone who knows the answer will be searching through rootschat...