Family Artifacts - who will take them when I die?

I have a collection of documents and other artifacts from our family dating back in history to at the least the 1800s. Carpentry and lumberyard tools, Masonic pins, watches, jewelry, books, Homestead papers, and many other vintage items need to be identified and assessed, and most importantly decisions made as to who will take responsibility for them when I am gone. I've thought of creating a photobook of them all, which would be a fairly easy project. But who will take the actual artifacts themselves?

Then there is the awareness that my sister has an equal amount of such memorabilia in her possession. 

I'm getting close to corralling everything. I hope to catalog it all somehow and then educate my sons about the entire collection. Maybe attach a letter of instruction. If my sons don't wish to inherit the items, perhaps my niece and nephews would be interested.

As obsessive as my mother was, there is information she missed sharing with us about some things. She left us a whole bin of random memorabilia with an attached note that said, KEEP FOREVER. It was sad to go through the items in that bin and have no idea what they meant to her.