Charles was stabbed to death when he was attacked by five men on his farm, Armadale. His wife Janet was stabbed and beaten unconcious and admitted to hospital in Port Elizabeth.
The attackers stole some firearms and fled in a bakkie.
A Police spokesperson said the men were arrested near Knysna on Monday night.
The Democratic Alliance has denounced the attack and has made repeated calls for rural safety units to be established, yet Police Minister Nathi Mthethwa has done nothing to fill the security void left when the commando system was finally disbanded in 2009.
“There is clearly a lack of political will to protect farmers and farm-workers, even though farm-workers are the ones whose families are most in jeopardy as a result of these attacks. This lack of political will translates into a lack of any robust plan for rural safety.
Meanwhile, ministers have spent a collective R530.6 million of taxpayers’ money on VIP protection services to ensure their own personal safety over 2010/11” said Athol Trollip from the DA.