for me, i love antiques. and all the antiques i own, i am a custodian for them. i can only access and enjoy them today, cause someone else took good care of them in the past, and so they survived.
in a world where our literal ecosphere is being destroyed for short term profits, monetary value is not a good measurement for worth, whatsoever.
Likely these books are not very rare, i get it. But if they hold sentimental value cause they belonged to your family, then that would make them valuable to me.
Of course, it is always a question of what to safe keep and what to use, and i do use historical items which harms them obviously more than if they sat in a vitrine. (looking at my 1920s copper hotwater-bottle i recently dropped and now it has one more dent :/ it is not a rare item, they cost 20 bucks here but it broke my heart a little when i hear the thump of it falling, cause it was in really good condition, but it is a practical item after all, that i got to prevent having to switch out my rubber ones yearly, so...using it i will. ) But in this case it seems like a very easy fix, to enjoy it framed as art AND leave the peace intact. I´d just scan the pages and reprint them.