The 81-year-old man, who is bedridden, was beaten up in his bed, according to the Herald Online.
The attackers then moved on to his caregiver. Afterwards the man’s 74-year-old wife was tied up in her bed, gagged, then kicked and hit with a screwdriver.
They carried the two women to the man’s bedroom and boiled the kettle, threatening to pour boiling water over the trio unless they handed over the safe keys.
Police said the robbery appeared to be well planned. Valuables worth about R100 000 were stolen. One of the attackers was arrested while running through neighbouring gardens trying to escape.
Humewood station commander Brigadier Ronald Koll believed the group had been involved in a series of other robberies.