I don't understand why, if Haz wants to bring the fam over for a summer holiday in Norfolk for eg, Wills can't send a car to pick them up from the airport, just as he likely would with any guest, and they can spend a couple of weeks at lovely, secluded Anmer with their cousins. There they will have all the protection afforded them courtesy of the PoW. It's almost like he's looking for an excuse not to 'reconcile'....
Also, ex PMs will have protection because they have spent a career making politically sensitive, national and global decisions. Not because they are 'mobbed by fans wanting a selfie' (his last 'security scare' at Invictus)