Hiya Richard. These will all likely have more sentimental than retail value, as they were left to you by your mother - enjoy them for what they are!
Rich, are you interested in selling these or acquiring new ones to add to your collection ? It might pay to watch auctions of bills on HA or even Ebay.
Silver certificates may have a premium, but the $2 notes are common and can be picked up at most banks for face value. They may have more sentimental value than collector value. If mom kept them, maybe you should too.