Just catching up w/ this thread. Glad you and your AC made your decisions about the contents of that box, Razz. I agree w/ others that you have raised two kind, wise AC.
I'm not surprised by the memory box or the money offered. Often, I read/hear about GPs saving just this kind of box to leave to their EGC upon their (the GP's) death or to send them when they are 18 or so. As you may have noticed, this very topic has often come up on this site.
Also, I've heard/read of GPs saving money for their EGC to give them as adults or leave to them in their will. IMO, it took a lot of character for your AC to turn that money down. Don't be surprised, though, if she still leaves it to them in her will, just to try to have her way. Maybe not, but if she does, they can always give it to a favorite charity.
Love your/their ideas about the pictures! How true that they record the "family tree" w/o passing down any of the unhappiness.