When Prince Charles attacked Diana's family with brutal remark at Harry's birth

Prince Charles had a rocky relationship with Princess Diana and their marriage was marred with controversy. 

The Prince and Princess of Wales were never on the same page, so much so, that there was a time when Charles even hit out at Diana's family following Prince Harry's birth.

According to Palace insiders, Charles made a brutal comment about Harry's red hair.

Royal expert Angela Levin revealed in Channel 5 documentary When The Spencers Met The Monarchy, "He [Charles] is alleged to have said my goodness he has got red hair."

"That was clearly a remark aimed at the Spencer family," added historian Piers Brendon. "Their distinctive hair was already visible," he added.

More recently, Harry divulged details about his tricky relationship with his father.

The Duke of Sussex said Charles 'stopped taking his calls' after he communicated to him how he wants to quit the royal family.