A big brother knows exactly why his sister is acting up and he isn't afraid to let her know, in this cute and funny video which is well on its way to going viral.
The cause of her distress isn't clear (as is so often the case), but big bro makes it clear that he knows exactly what's going on here.
"Did you have a nap today?" he asks pointedly, getting right to the heart of the matter.
"I caaaaan't!" wails little sis.
"Well, you really need one," the older boy says, frankly, and we can't help but agree!
Little sis is not exactly keen on her brother's suggestion, however. "No, I don't!" she cries. Judging by the lad's expression, we don't think he's convinced.
The clip, which has had over 300,000 views in three days, first appeared on clip compilation show America's Funniest Home Videos last Sunday, and has been spreading over social media since then.
We love it when we see an older sibling stepping in to offer some precociously mature words of wisdom to a younger member of the family, and in this case we reckon he's got a particularly important point.
In fact, we reckon plenty of adult tantrums could be avoided if naps for grown-ups were more socially acceptable...
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