5 things you didn't realize about Warren Buffett, according to his daughter

Prior to his large gift to several foundations and the Bill and Melinda Gates Foundation earlier this year, Warren was ridiculed by critics for not giving money to charity. Susie believes this is a side effect of her father's belief in investing for the long haul.

"His theory, of course, was that he was good at making money and there would be a lot more to give away if he could keep making it," she said.

But she said that her parents were giving back to the community for decades. They just weren't tooting their own horn.

"My mother was quietly giving a lot away," she said. "She started a scholarship program, actually, when I was in high school. It was only a couple kids a year, but she started as soon as there was some money there to give away. Neither of them have ever been the type to look for any recognition when they were doing philanthropic things. And it was certainly my mother doing it more than my dad at that point. And so I think there was a little more happening than people realize."

"I actually agree with his philosophy of not dumping a bunch of money on your kids. And, by the way, my dad gets a bad rap for that," Susie told us. "He has been much more generous than people are aware. I feel extremely grateful to have the parents I had and for what they’ve given us. But certainly, he’s not going to leave us $50 billion and shouldn’t. It would be crazy to do anything like that."

Warren's decision in 2016 to give much of his fortune away to charity partly benefits foundations created by his children.

"My mother, by the way, grew up Republican, too. And nobody knows that. That’s a funny thing," Susie told us.

At one point, Susie recalled, her maternal grandfather ran her paternal grandfather Howard Buffet's election campaign.

"The only time my grandpa Buffett lost, actually," she said. In all, Howard served four terms in the US Congress.

In "Becoming Warren Buffett," the family speaks of how thankful they were that Astrid Menks stepped into their father's life after their mother moved out in the early 1980s, though she never divorced Warren. Susie said that it wasn't as seamless as it appeared.

"There were absolutely growing pains," she said. "I knew Astrid before my parents did. So, yeah, that’s a strange little part of it. It was very funny. My problem with it at the time was that I am very close to my dad and, as my mother says in the film, he can't find the light switch. I was just worried that he wouldn’t know how to eat, how to cook any food. He just doesn’t know how to function, except go to work. I think it’s fair to say I was a little bit mad at my mother about leaving. I didn’t quite get why she was leaving. I was concerned about him being able to function in the normal world."

Susie said that she actually moved back home to Omaha for a month because she worried about her father.

"I had some trouble with it, for sure," she said of Astrid moving in. "My mother and I had many talks over the years about it and my understanding certainly evolved over the years and changed. And I totally got it eventually."

Though Warren has said that he drinks roughly five cans of Coke every day, Susie joked that her father "doesn’t have a room dedicated to" storing the drink. He does have an old-fashioned soda fountain for the drink at the office for his holdings company, Berkshire-Hathaway.

And just in case people believed that a perk of being Coca-Cola's biggest shareholder means he gets free drinks, Susie said that Warren actually pays retail for his addiction.

"It was stockpiled more when my mother lived there," Susie recalled, "probably because she figured it was cheaper to buy a whole big bunch at once than to go into the grocery store frequently. [Warren's second wife] Astrid is more likely to try to find out where it’s on sale and buy it on sale."