On tonight's episode of Bravo's reality TV series "The Real Housewives of Beverly Hills," Yolanda Foster sits her children Gigi, Bella and Anwar Hadid down to talk about her will in preparation for her upcoming surgery. Her kids look visibly upset at the thought of something happening to their mom.

Gigi, a 20-year-old Victoria's Secret model, is seen in the first scene of the sneak peek clip preparing Gruyere grilled cheese sandwiches and soup for lunch with her 19-year-old sister, model Bella, and 16-year-old Anwar. The three then carry the food up the hill to their mom and grandmother to share the meal together.

Foster is preparing to leave the next morning for surgery to remove a leaking breast implant, as reported by Us Weekly, which will help decrease the discomfort she has endured from her Lyme disease symptoms. Before lunch, Foster picks up an envelope from a table and sits down next to her oldest child, Gigi.

"I printed out this for you," she says to her kids. "It's in my safe."

She holds up the manila envelope to show her children. On the front, Foster wrote "August 2015" and her children's names with hearts.

"I just wanted you to see it so you know what it looks like and this is for you guys," says Foster.

"What?" Bella asks her mom.

"It's nothing, it's just my will," says Foster nonchalantly.

Anwar, Bella and Gigi all look concerned. Gigi then speaks up on behalf of her siblings.

"That's not 'nothing' and I don't like how you just say that so calmly," says Gigi, not looking at her mom.

"I'm saying it calmly because it's important," says Foster. "Nothing is going to happen, but I just want you guys to know that this is in the safe and that's all you need to know."

Watch the full sneak peek below and be sure to catch the next episode of "The Real Housewives of Beverly Hills" tonight at 9 p.m. ET on Bravo.