Kate Winslet Reveals Her Kids Encouraged Her to Make Avatar Sequel: 'You Have to Do It!'

The Oscar winner talks about her kids' Avatar encouragement and reuniting with her Titanic director 25 years later for Avatar: The Way of the Water

Kate Winslet doesn't normally involve her children in any career decisions, but when the topic of joining Avatar: The Way of Water 

came up to sons Bear, 9, and Joe, 19, and daughter Mia, 22, the actress discovered a few surprise Avatar superfans in her midst.

Winslet, 47, tells PEOPLE of getting the initial call from director James Cameron in this week's issue.

He called me and described the role and I thought, 'My God, that sounds amazing.' And my kids were like, 'Oh my God, mom, you have to do it

I was like, 'Obviously.' I said, 'Well, they're going to send the script.' They were like, 'No, it doesn't matter. Just you have to do it!'"

In addition to having her kids' blessing, the role in the highly-anticipated sequel also offered the Oscar-winner an opportunity to reunite with her Titanic director

We've totally kept in touch over the years. He's very good at Christmas and birthday presents," Winslet says of Cameron. "He always remembers. He's amazing."