It’s kosher, just the (to me) impossibly clean cut Marsh family and one of their songs based on the news. Given the subject, I found it in questionable taste, but they’re not my thing at the best of times.
They are wonderfully talented but I prefer their more light hearted parodies.
The youngest child is only about 11 I think and I know this performance is meant to be somber but it almost smacks of brain washing. They are churning them out at such a rate now I wonder if the kids will eventually get bored with endless rehearsing.
Just my opinion of course and I can see why they are so popular.