United Kingdom, Feb. 8 -- Khloe Kardashian isn't sure the children in her family will get along when they are teenagers.

The 40-year-old reality star has True, six, as well as two-year-old Tatum with her former partner Tristan Thompson and while she is grateful that the siblings are friends with their famous cousins now, she has no idea what their relationship will be like in years to come.

She told People: "They're like each other's only friends, which is I think great. But I don't know how they're going to feel when they're teenagers."

'The Kardashians' star recently celebrated the birthday of her niece Stormi - who is the eldest child of Kylie Jenner and Travis Scott - and noted that it is "really crazy" just how fast the children i...