Kris Jenner in tears after Kim and Rob tear each other apart during bitter row in Keeping Up With The Kardashians

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By Chris Johnson

A mother's job is never done, as Kris Jenner is well aware.

In last night's episode of Keeping Up With The Kardashians, the 55-year-old was left in floods of tears after her grown up children Kim and Rob got into a bitter war of words.

The mother of six - who also manages her children's careers, broke down during a heart-to-heart with Rob during the family's vacation to Bora Bora.

Emotional: Kris Jenner broke down in last night's episode of Keeping Up With The Kardashians after her children Rob and Kim got into a heated argument

Just minutes earlier, Kim, 30, and Rob, 24, were at each other's throats when Kim once again reminded her brother how he earns the least out of all the family.

She called him a 'loser' and pointedly said: 'Even Kendall earns more than you.'

Rob took the bait and got very sensitive about her remarks, calling his sister a 'wh***' in front of Kim's now-husband Kris Humphries.

Feeling low: Rob told his mother that he was feeling lost during a heart to heart and said he wanted to figure out something meaningful to do with his life

Mother and son moment: Kris gives her son a hug as she promised to stand by him and help him find a career path to follow

When mother Kris arrived just after the altercation, Kim relayed what had happened and said that she thinks he could be bipolar.

In the mean time, an enraged Humphries was unhappy about the way Rob had disrespected Kim in front of him and said he was ready to 'lay hands' on him.

Later, concerned mother Jenner went to speak to her son.

Food for though: The scene of the row, which saw Kim berate her brother, calling him a loser and pointedly reminding him he does not do any work

Turning wild: Rob retaliated by calling his bikini-clad sister a 'wh***' in front of her new husband Kris Humphries

Rob told her that he was sick of Kim - the queen bee of the family and highest earner - always disrespecting him.

He also said he wanted to get some direction in life and find a career path.

'When I get back to LA I need to think about what I am going to do,' he said.

'All my friends are now graduating from law school, that's what I wanted to do, that's what my dad did, but it's too late for me now.'

Tense: Kris grapples with Rob, telling him that he wants to lay hands on him for disrespecting Kim in front of him

Restrained: Bruce Jenner intervened as things turned nasty

Having words: After her heart-to-heart with Rob, Kris Jenner tells Kim to show her brother love and support 'because he really needs us right now'

Getting tearful, Kris told him: 'It's not too late for you,' before encouraging him to follow his dreams.

She then broke down, saying: 'I can't help that your father isn't here now, or that your sisters have the careers they do right now.

'But the worst thing for me as your mother is to see you unhappy.'

The pair then shared a hug, as Rob vowed to get a grip on his life and decide what path to take.

The happy couple: Kris and Kim relaxes in their presidential suite during the Bora Bora trip

Mulling things over: Rob relaxes by the turquoise-coloured waters with a beer in hand

Later he joked with the rest of the crew: 'I would even consider doing porn right now.'

He also made friends with Kim later that day over a family dinner.

Kim apologised to Rob for calling him a loser and her brother also duly told her he was sorry for snapping at her too.

Feeling the strain: Kourtney and boyfriend Scott Disick, seen here with son Mason, came to blows over his drinking once again

Meanwhile, Kourtney and boyfriend Scott Disick came to blows again after she became concerned about his drinking.

Disick had a business meting with a vodka firm he was doing business with, which Kourtney was not best pleased about based on his history with the bottle.

Scott assured her he was not going back to his old ways, and only drinks now to 'relax' rather than for the sake of getting drunk.

Celebration: Later in the episode Kris and Bruce Jenner renewed their wedding vows after 20 years of matrimony

Family affair: The family were on hand at the ceremony to watch the happy moment

But Kourtney warned him she was not prepared to put up with him going back to his old ways, warning him: 'If you even get half way close to the way you were in Miami...'

Elsewhere, Kris and Bruce Jenner renewed their vows as they celebrated 20 years of marriage.

It inspired Kim's other half to pop the question and at the end of the episode he asks Bruce if he can have Kim's hand in marriage.

The season finale airs tomorrow night on E!