Welcome back DB. Holy crap those are big pic files.
Those are not Samurai swords, but WWII officer's swords with Chrisanthimum tsubas. You have a real treasure there. If you have any provenence (letters or details from your Stepmother's father) keep them with the swords and do not separate them if you ultimately sell them. And whatever you do, DO NOT ATTEMPT TO CLEAN OR SHARPEN THEM IN ANY FASHION.
Very nice collection.
I'm way jealous!!