I think at this point the public argument over whether they will/won't and should/shouldn't is pointless, and the ongoing speculation just fuels tabloid drama.
Inviting them was fairly inevitable as they're part of Charles's immediate family. They're not working royals so their attendance would be unlikely to provide more than a bit of a photo op and provide Harry a chance to show his father some support.
Whether Harry actually wants to show support for his father, and whether they can cope with the reception their statements and Harry's disclosures will cause (both from the public and within the family) is something only they can decide.
Inviting them was fairly inevitable as they're part of Charles's immediate family. They're not working royals so their attendance would be unlikely to provide more than a bit of a photo op and provide Harry a chance to show his father some support.
Whether Harry actually wants to show support for his father, and whether they can cope with the reception their statements and Harry's disclosures will cause (both from the public and within the family) is something only they can decide.