As of yet, it's unclear why Christopher was removed from the will.
However, we do know how the exclusion was worded:
'I would like to express my love and affection for Christopher Keith Harrison; however for purposes of this Will, I have intentionally and with full knowledge failed to provide for him and his issue,' the document stated.
Rick has since released a statement to Fox News regarding the issue: 'The family had previously discussed this information and it is a private matter.'
Rumour has it that Richard had initially named his wife and all three of his sons as beneficiaries.
However, in 2017 the document was amended and Richard signed an updated will which specifically cut out Christopher from inheriting any of his estate.
Richard's passing at the age of 77 was officially confirmed by his son Rick via a touching Instagram post.
'Richard Benjamin 'The Old Man' Harrison passed away this morning surrounded by those he loved,' he captioned a photo of his father.
'He will be tremendously missed by our family, the team at Gold & Silver Pawn and his many fans the world over.
'He was my hero and I was fortunate to get a very cool 'Old Man' as my dad.