Zero Evidence
What supports everything that Sarah Ferguson said is the fact that there has been zero evidence presented to support the fact that Meghan and Kate aren’t getting along. Not only that, but there have been multiple fights between Harry and William. Frankly, from what we can see looking at their united appearances, as well as numerous photos from upper-class ceremonies, these four seem to be doing just fine when they are together. Not only that, but we think that, much like Diana and Sarah, the two sisters-in-law have become quite good friends given how much time they were spending together for the first couple of years.