My MIL attends a memory clinic every 6 months. We take her to the appointments and each new one is arranged at the previous appointment. Recently we had to change the date of her next appointment as we are unable to take her on that date.
The clinic sent the date of the new appointment in a letter to HER. Luckily we have a re-direct on her post (it all comes to us) for just this sort of thing, but we didn't expect it of the memory clinic and it was my DH (her son) that rearranged her appointment. They know he has POA. At the least send us a copy of it.
Gotta laugh haven't you?