Sounds like the article I recently read in the Denver Post about lions coming into downtown Boulder.
Duh...deer hunting is mostly frowned upon by the majority of those who live in the land of fruits and nuts.
Many a lion has been taken out of a tree with a .22 pistol, so the consensus seems to be that it doesn't take much to kill one.
I used to purchase a tag every year for many years and never got a shot, back then I was trying to call one in with a mouth call and hunted in a two man team, my partner used a 12 gauge for close in or brushy areas and I used a 30-06 and had a 10mm on my hip.
I have called in several while hunting Coyotes (when I didn't have a tag of course) and was using an electronic caller, which isn't a legal hunting method for lion in Colorado, (one must use a mouth blown call for lion, the logic behind that is insane with a potentially dangerous predator like a lion, but the law is the law) so of course we couldn't shoot.
For Coyote I use a 22-250 or .223 which I'm sure with the right bullet, would deliver on a lion, but I ALWAYS had the 10mm loaded with 200 grain XTP's on my hip.
In a 9mm I'd recommend and do carry premium 147's, Gold Dots, Ranger T's, HST's and XTPs, but not in the woods.
I'm south of Boulder, but still on the foothills in a similar ecosystem, thankfully minus most of the fruits and nuts and I carry a 10mm as a minimum caliber when bears are out, there are lot's of them and they've become habituated with humans for the same reason, lack of hunting. Some can and do get quite large in the 500+ pound range and I've taken to carrying a 4" 629 if I think they may be around.
Sometimes in the winter I'll carry a .45acp when I think the largest wildlife threat would be a lion. But it's usually the 10mm, with 200 grain XTP's if I think lions only might be about.
Personally I think your G26 stoked with the heavy for caliber good performing 147's would work on a lion, with the 10mm being preferable.
If it were me and my kids I'd have some serious discussions about playing in the woods, especially if the child is younger. Especially in the many riparian area's coming into town from the foothills, which is prime deer/lion habitat.
Of course age being a consideration but things like always be in a group, don't get out of sight of adults and no screaming like little kids are prone to do, this sounds just like the predator calls I use to call them in.
Odds are you and your G26 won't be there to be of any help. So teaching the kids about outdoor awareness in lion or bear country should be paramount. Not to mention all the issues we've had recently with little kids being attacked by Coyotes.
Lions have and will go after small children we've had several instances in Colorado, not to mention the occasional adult.