On his morning KIIS FM radio program, The Kyle and Jackie O Show, Kyle went on a nasty rant, criticising Grant’s nomination for a Gold Logie.
The 47-year-old shock jock called up Grant’s “illegitimate step half-brother”, who goes by the name “Isis”.
Awkwardly, Isis – whose real name is Dan – also happens to work for Kyle and his co-host, Jackie O, despite his 40-year-old brother having his own radio show on rival network 2Day FM.
After saying Grant’s TV and radio shows were failing, Kyle went on to say he was “surprised” when he found out the Family Feud host had been nominated for the coveted Gold Logie.
Isis – who admitted he was not close to his brother – said he was also “gobsmacked” by Grant’s nomination for the award.
Kyle then asked Isis if he was fed up with his brother getting “all the wins in life”, but Isis unconvincingly said he was happy for him “in a way”.