Perhaps find a passage in the bible about the love of family, highlight it and reference it in the inscription. Whether or not religious I think they will cherish anything written from the heart. Perhaps a reference to how important they are in your life much like the bible has been in yours and you hope that they may find all the answers their heart seeks either in the pages of the gift that you are giving them or in the gift that is the present...
(I can see how someone who is not interested could be offended but, I think if my grandmother gave me a religious icon that I was not interested in and used it as a reference to how much I mean to her, I could overlook the vessel the message came in and truly relish the message. I would see it as an offer of something that had given her peace comfort and solace and her hope that she could offer me the same. in fact that may be the right idea for an inscription.)
at 7:38 PM on Dec. 13, 2012