In this Forbes piece, Eric Trump is the hero. He's donated $15 million-plus to St Judes. Once Donnie realized St. Jude wasn't paying anything to use their properties for charity he made sure that wouldn't happen again.
An excerpt from the article...
The real star of the day is Eric Trump, the president's second son and now the co-head of the Trump Organization, who has hosted this event for ten years on behalf of the St. Jude Children's Research Hospital in Memphis. He's done a ton of good: To date, he's directed more than $11 million there, the vast majority of it via this annual golf event. He has also helped raise another $5 million through events with other organizations.
The best part about all this, according to Eric Trump, is the charity's efficiency: Because he can get his family's golf course for free and have most of the other costs donated, virtually all the money contributed will go toward helping kids with cancer. "We get to use our assets 100% free of charge," Trump tells Forbes.