Millie Bobby has an adult relationship with Henry Cavill

Millie Bobby Brown and Henry Cavill play siblings in 'Holmes 2'

Millie Bobby Brown is 18 years old while Henry Cavill is 39 years old, but Millie has no problem with this relationship.

 Brown told Deadline, "With Henry, it feels like a real adult relationship. Like a really good friendship, a really healthy one. One that we have terms and conditions."

She also said that I know Henry. I have their terms and conditions with me. I am not allowed to ask about his personal life.

It's a different type of relationship than the one shared with the Stranger Things co-stars.

Brown and Schnapp have an agreement that they will marry if they are 40 years old and unmarried.

Brown is dating Bongiovi, the 20-year-old son of Jon Bon Jovi.

In New York City, Cavill and Millie Bobby Brown attend the Netflix Enola Holmes 2 premiere on October 27.