Inheritance – Kind of

Hey all,
For years I've been buying my mother a book tokens for her birthday and having it personalised with my children , her grandchildren on it.( she loved it)
She passed away last week and it turns out she has not been using them, even though she read loads, and they were given back to me. I gave nearly £200, and would love to buy some books which are a bit special and nice keep sakes. What would everyone recommend? I'd like to buy something for myself, my wife and something for my 2 children.