"I've sparred with Sonny ... he's one of those athletes who's good at anything - league, boxing, rugby, everything - so I'm proud to call him my brother."
Williams provided the pivotal moment of last week's 24-21 second-test loss for the All Blacks in Wellington, when he was red-carded for a careless shoulder charge, reducing his team to 14 players for most of the game.
The blockbuster second-five was subsequently suspended for four weeks, ruling him out of the third and deciding test.
"He'll be disappointed," said Parker. "He's one of those guys who wants to get on the field and show what he's made of, and he's always a playmaker.
"I think he'll be cheering the boys on with interest and a lot of pride."
Not surprisingly, Parker was tipping an All Blacks victory and issued a warning to their opponents.
"Lions, I want to wish you all the best, because you're going to need it ... the All Blacks are going to come strong."