@Thinlyveiled To be fair, H & M would have been criticised for talking about Charles and Kate's health whilst estranged from them.
And having said that, Harry has managed to leak that he and M sent a private message to Kate after her illness was revealed; they also made a short public statement wishing her something like health and happiness.
With Charles, he did his 'mercy dash' across the Atlantic, saw Charles for 45 minutes (max), spoke to the media about the visit while on a trip to Canada I think, and has recently said he doesn't know how long Charles has...
I think that's quite enough from him really.