He's picking up the slack.

Scott Disick took a break from hanging with girlfriend Sofia Richie to be a dad to son Mason, taking him to boxing class in Calabasas yesterday. Where was Kourtney, you ask? Well, she's currently on vacation with boy toy Younes Bendjima in Punta Mita, Mexico, so she's left the parenting duties up to her hard partying baby daddy.

It's amazing that Kourtney and Scott are able to co-parent! They both have new love interests and seem to spend more time on vacay than they do with their brood, so we have a feeling grandma Kris Jenner is doing a lot of babysitting.

Even though it appears LD has moved on with Lionel Richie's daughter, he isn't having an easy time with Kourt being in a serious relationship.

A source tells X17:
    "It doesn't matter that Scott is dating Sofia, he still hates the fact that Kourtney is with Younes. He thinks he's too young for her and a total poser. He also likes to plant the seed that Younes is only dating her for fame and to advance his career, and it really gets under her skin. Kourtney didn't expect to get so serious with Younes, but now she's head over heels. She is even thinking of marriage and another baby down the road, and that's Scott's worst nightmare."

We're always rooting for The Lord!