Prince Harry writes that Meghan acknowledged the tension between the four of them and suggested that it might have gone back to when she first joined the family. There was a misunderstanding that had almost gone unnoticed, where Kate thought that Meghan wanted her fashion contacts.
However, Meghan had her own contacts, and they had apparently gotten off on the wrong foot. The situation was magnified by the wedding and the bridesmaids' dresses, but there were other things that they had been unaware of.
Prince Harry also mentions that William and Kate were upset that they had not received Easter presents, which was apparently a thing that they did. However, neither Prince Harry nor William had ever exchanged Easter presents before.
While Prince Harry acknowledges that their father made a big deal about Easter, he didn't think it was a big deal. Despite this, they apologized to William and Kate for not giving them Easter presents.
