Splitting Up Together Show Summary, Upcoming Episodes and TV Guide

Milo complains that Grandparents Day is coming up at school and doesn't feel Henry is interesting enough to participate. Lena and the kids urge Martin to reconnect with his long-estranged father, Brock, to rebuild their relationship. Meanwhile, Lisa continues to struggle financially and considers moving back home with her parents. Elsewhere, after listening to a true crime podcast, Maya worries that Frank has a dark past he has been hiding.

Lena and Martin announce to the kids that Lisa Apple's baby, Annie, is their half-sister, and Martin is surprised when they aren't interested in meeting her. Lena feels the burden of being stuck in the middle between Martin and Lisa but still offers to help bring both families together. Meanwhile, Mason overhears Lena and Martin's conversation about Lisa's financial difficulties and decides to start a fundraising campaign to help. Elsewhere, Lena feels a bit of empty nest syndrome when she attends Mae's college fair at school.

Lisa's unexpected pregnancy causes more complications than what Lena and Martin anticipated. Without Martin's knowledge, Lena decides to help Lisa despite her insistence about not wanting them involved in the baby's life. Meanwhile, Mae and Mason try to force Lena to admit that she and Martin are back together. After Maya's false labor scare, she returns from the hospital and is put on bedrest by Frank who insists on taking care of her.

After a doctor's visit, Arthur learns he's under high stress due to Valentine's Day approaching. To de-stress, Arthur suggests his concerns to Camille and asks if they can take a break from the holiday which causes them to fight. He shows up at Lena and Martin's house, where they help by taking him in. Meanwhile, Maya and Camille express disapproval when Lena decides she wants to cook a platonic Valentine's Day dinner for Martin at home. Elsewhere, Mason organizes a Valentine's Day flash mob for his girlfriend.

A concerned Lena tries to figure out if Mae is romantically involved with her new best friend, China. To make matters worse, Mae asks if China can sleep over, which makes Lena uncomfortable and forces her to confront her own issues with intimacy. Meanwhile, Martin worries about Mason's relationship with his new girlfriend, Bronwyn, and gives him advice to help avoid another heart break.

After Lena and Vlad's unexpected kiss, things get more complicated as they begin their new work partnership while working with a new client. Elsewhere, Martin goes to Paige's house for more privacy and gets a glimpse into what a more typical divorced home life is, causing him to become uneasy. Back at home, Mason and Mae go head-to-head after Mae finds out that Mason has a crush on a pretentious girl at school.

Lena tries to support Maya in any way she can with her pregnancy, only to get accused of being too controlling and taking over. Meanwhile, after Martin reads Mae's diary, he suspects that she is romantically involved with her teacher and panics. Elsewhere, Arthur and Camille volunteer to temporarily take in Arthur's teenage nephew to help his overworked sister.

Lena and Martin's escalating battle for control of the house is put on hold when Milo announces he wants to go to a school for the gifted - to which they think he will not be accepted. Meanwhile, they both meet a contractor for the house, Vlad, but Lena undermines him and scares Vlad away. Things get uglier between Lena and Oliver after she introduces a new member to the family as payback for all the back-and-forth about the house. Elsewhere, Lena and Martin give conflicting advice to Mason on how to deal with his recent breakup.

Afraid that the answer could ruin his chances with Lena, Martin finds every way he can to avoid asking Lisa Apple if she is pregnant, while the potential pregnancy makes Lena more and more distant. At the same time, Lena worries Mason is changing himself to please his new girlfriend and finds parallels to her own relationship with Martin. Elsewhere, Maya tells Frank a pretend story about her 'friend' who is dating someone new and pregnant to gauge what his honest reaction will be.