TwentyTwelve Child theme not working

I’ve created two child themes for https://scottfishercarpentry.com; one works and the other does not. And, of course, the one that I want to use is the child theme that isn’t working.

Here’s the child theme that does work: https://scottfishercarpentry.com/wp-content/themes/twentyeleven-child/style.css

Here’s the one that doesn’t work: https://scottfishercarpentry.com/wp-content/themes/twentytwelvechild/style.css

As you may notice, there isn’t a dash or a space between twentytwelve and child in the directory, since I tried ian277’s solution. Needless to say, that didn’t work/didn’t change anything noticeable.

I can see all four child themes in the theme section of the admin. I can also activate it. But it does not pull in the style from the parent theme.

Suggestions?