Kimberly Stewart, Scott Disick relationship is affecting her ties with brother Sean

Scott Disick and Kimberly Stewart's romance is reportedly causing tensions with her ‘very protective’ brother Sean.

The reality star, 39, who has dated number of high-profile woman, including Kourtney Kardashian and Sofia Richie, a source told Page Six that the son of music legend Rod Stewart, 42, is 'scared that Kimberly will break [Disick's] heart.'

'Sean is very protective of Scott,' the insider revealed to the outlet, before claiming the siblings 'do not get along at all.'

Apparently, the source alleges that Kimberly 'doesn't think her brother is 'smart' and lacks 'any ambition.'

'He was constantly complaining about her. She bosses him around, yells at him, and basically tries to tell him how to run his life,' the insider revealed.

'Her relationship with Scott can't make things any easier between the two siblings either,' the insider explained.

The source noted that the trio are all 'super dysfunctional' and the sibling's relationship is constantly 'up and down.'

'Now that Scott is back [in Sean's life], Sean is being overly greedy about the time he's spending with him,' the source explains.

Disick and Kimberly first sparked dating rumors back in 2015 after his split with Kardashian, but the model's mom shut down speculation by telling the world they're just old 'friends' and there was 'absolutely no truth to the rumours.

Scott was then spotted hanging out with Kimberly, Rod, and her brother Sean in May as Kourtney prepared to tie the knot with Travis Barker in Italy and on a series of dinner dates over the past few weeks.