Big sister knows best! Lionel Richie isn't the only family member who isn't fond of Sofia Richie's relationship with Scott Disick.

Sofia's half-sister, Nicole Richie, isn't too thrilled either.

Hollywood Life reports that Nicole has been pleading with Sofia to end her relationship with Disick before things get too far and before Kourtney Kardashian's kids get attached to her. <

A source claims that Nicole was truly bothered by Sofia's relationship with the Keeping Up With the Kardashians star. When her sister started hanging out with Disick's kids, she realized things were getting serious between the two.

"Nicole thinks Scott is way too old for Sofia and Nicole is freaked out when she learned that Sofia has been hanging out with Scott's kids too," the source stated.

Fans of Kardashian know that she shares three children with Disick, 8-year-old Mason, 5-year-old Penelope, and 3-year-old Reign.

The paparazzi caught Sofia and Disick out several times before and his three children were in tow. Recently, the pair was spotted out in Los Angeles with the reality star's two eldest children, Mason and Penelope.

The outing sent social media into a frenzy as several social media users pointed out that the model is way too young to be playing stepmom to Disick's children.

Kourtney Doesn't Want Sofia Around Her Kids

Nicole is not the only who wants Sofia to stay away from the Disick kids. Sources have stated that Kourtney Kardashian doesn't want Sofia around them either.

The former Kourtney and Khloe Take The Hamptons star has reportedly asked Disick to stop bringing Sofia around her children.

"Kourtney does not like the influence Sofia has over the kids and she does not want the kids getting attached to someone that Kourtney feels will not be around or a part of their lives very long," a source close to Kardashian explained.

Will Scott And Sofia Last?

Despite Nicole's and Kardashian's feelings about Sofia and Disick's relationship, the two have been together for some time now.

The first time that the duo became an item was during the Cannes Film Festival in May 2017. However, neither of the two confirmed nor denied their relationship.

It was only in December of last year that the couple went public with their relationship. Their appearance in Art Basel in Miami confirmed rumors that they were already a couple.