Are at their wit's end - Idioms by The Free Dictionary
be at (one's) wit's end (redirected from are at their wit's end)
be at (one's) wit's end
To be in a state of distress because one has no more patience or mental stamina, often after having dealt with some kind of problem or difficult situation. The baby's been crying for hours, and I'm at my wit's end! I'm at my wit's end, so if this train gets delayed too, I'm going to scream.
be at your wits' end be overwhelmed with difficulties and at a loss as to what to do next.
be at your wits’ ˈend be so confused or worried that you do not know what you should do: I can’t pay the bills, the bank won’t lend me any money, and I don’t know what to do — I’m at my wits’ end.