According to the UK Telegraph, Ms Reddick also told Mr MacInnis to put both names on the ticket for "good luck" — but denies she ever intended to share any prize.
Instead, the 57-year-old said she had been prepared to give her nephew CA$150,000, but that he had insisted he was owed half, as both names were on the ticket.
Things turned ugly at the cheque presentation, with the CBC network reporting Ms Reddick as saying MacInnes "didn't deserve" the cash.
"See you in court," she reportedly said at the event. "He's dead to me."
Reddick stuck to her guns, and the case is now before the courts.
And according to Global News, Supreme Court judge Patrick Murray has now frozen half of the winnings — MacInnes's share — while the dispute is dealt with.
"Unfortunately, what should have been a joyous occasion was not," the judge said at a ruling this week.
According to the Canadian news outlet, Reddick said the pair's relationship could "never" be fixed following the feud.
Next month, MacInnes and Reddick will both meet for a settlement conference with a judge in a bid to reach an agreement without having to go to trial.
Reddick's lawyer Adam Rogers said he hoped a compromise could be made.
"We'll sit down with everybody with the judge and try to work out a settlement that makes everybody happy but that's to be determined by how the parties approach it," he said, according to Global News.