Hummm. Interesting stuff.
The first razor appears to have had a rather nasty chip near the heel that was "repaired" once upon a time. The rust looks like it *could* be surface bloom that could be cleaned up and the remainder of the blade could be honed. In all honesty, many collectors would probably call it done and possibly pilfer the scales for another project...being an heirloom, I would try and make use of it...if nothing else, there is nothing to lose.
The second has some interesting scales for sure. You (or I) could remove the scales and have a better look at that blade. I think it is a case where you must do something or it will deteriorate to oblivion otherwise. I hate to unpin an heirloom (or remove patina) but that appears to be a case where it would be necessary for the survival of the piece.
The third is something I have no experience with...sorry.
The mug and brush are perhaps the coolest pieces you have. If the brush is usable, simply shampoo it and go to it. If it is brittle and junk, you can either set it on a shelf, or remove the knot and purchase a new knot for it. That handle might be something really special
The mug is probably good to go...there is not much to go wrong with those that is not obvious.
You have some neat stuff there. I would either start reading up on it, or make a trip here sometime and we can restore them together.
Thanks for sharing!