Note to Prince Harry: You're being badly advised...

The Sussexes, of course, get lots of unsolicited advice and it's "all over the map". But some of the advice they're getting from their own chosen advisors is, well, not very good. Among other things it's short-sighted.
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Mine would have been as follows:

It's clear that you married for love and that you aren't the weak-minded and easily cowed fellow your father has so long proved to be, failing, unlike your mother, to defend you during your youth from the pernicious molding of a palace-run up-bringing the harms of which you yourself were aware at the time.

Given the appalling treatment of you and Meghan at the hands of the U.K.'s disgusting press corps-- treatment which your father apparently stood by and did and said nothing effective to oppose, if he did not, in fact encourage it from behind the scenes-- you have no good reason to accede to the King's wishes and accept an invitation to a coronation at which Meghan is clearly not welcome by the King or a vocal and press-backed minority of the British public.

Skip your son's fourth birthday to attend your father's coronation?

No. That's very bad advice. Harry, you ought to have listened to those who counselled you not to accept such an invitation--which comes with nothing of any apparent regret for or promised end to the outrageous manner in which you and Meghan have been treated--starting well before you were left with no alternative but to seek refuge outside Britain from a relentless and despicable press corps which fed like hyenas upon the two of you.

It's still not too late, Harry. You've shown you're a man. It's time to demonstrate that once again.

Take up the phone. Ring Pa-pa and tell him that, after some further reflection, you see that, under the circumstances, you cannot and ought not attend the coronation ceremony. Your attending the ceremony won't mend or even significantly contribute to mending a broken family relationship which your father and brother, by failing to stand by you, ruptured and about which roles they remain unashamed.