Fans have finally learned at what age the Big Three were around when they lost their father Jack (Milo Ventimiglia) on This Is Us, and while it will still be a while before the how and why and other details of his death will be revealed, the cast can assure fans that when that reveal comes it will be decastating.

In an interview with Entertainment Weekly, Mandy Moore, who portrays Jack's on-screen wife Rebecca who at some point married his best friend Miguel (Jon Huertas), revealed that she genuinely believes that the news will be difficult for everyone to process, and said what she hopes will happen as more details begin to drop.

"I'm not sure people are prepared for this. I hope it at least satiates some of their need to know what, when, how, why with Jack," she said. "Obviously, that's a question that is asked of us a lot, and I want people to be patient and almost forget about it. Yes, Jack is not alive in the present day, but other than that, he is very much alive in the show, and his spirit is here, even in present day. I hope that this will at least satiate people for the time being: 'Okay, now we know when it happens and we'll just let the story continue to unfold and not feel pressure to know all of the details.' Or maybe it will act as the exact opposite and people will be like, 'What????' That's what my hope is-people are like, 'Okay, they're this age, great. Now let me just watch the show, and I'll be worried anytime that time period's happening."

She also discussed the reveal that the Big Three were in their teenaged years when their father died, admitting that she thinks it's a powerful move because the age the kids are is one that is so critical and would have such an impact on their lives.

"It's potentially the most critical age because they are on the precipice of adulthood and need their father moving forward probably more than ever," she said.

This Is Us airs Tuesdays at 9 p.m. on NBC.

Tags: this is us nbc television