Kahr's not a bad choice....
A CW-9 is my every day carry right now, and will be until the Glock 43 is released to the general public. The Kahr is not one they'll enjoy going to the range and putting two boxes of shell through at a time, but for a "Get the hell off of me gun" it's pretty good.
It's not heavy...not too thick, and is comfortable for me to carry inside the waist band. It has a heavy trigger pull. If you've ever shot a double action revolver, in double action, then you'll know what the Kahr will feel like. I like that though, in a edc. Less chance of an accidental trigger pull, and if ever need it, the adrenaline will be flowing so much you wouldn't notice the pull anyway.
Another to consider..if you want to save a little green, is the SCCY. Very well built guns for the money, and although you can buy them for $239..they're not Saturday Night Specials by any means. Not even in the same ball park with Lorcin's...Jennings...High Points, and the such. Besides that, the SCCY carries a lifetime warranty that goes with the gun, not just to the original owner. And they're American made, right down there in Daytona Florida.
It's my "truck gun".
The best thing to do, is take the youngun's with you to an indoor range, that rents guns, and let them shoot 5 or 6 different guns and see what they are most comfortable with. At my range...you pay one rental fee...and you can come back to the counter and swap it for another without paying another rental fee. (Stick with the same caliber though, unless you want a bunch of partial boxes sitting around that you may or may not have a gun they'll fit.)
Whatever you do...I applaud you for getting them interested in protecting themselves.