The two siblings — who are famous for their family's reality series, I Am Jazz, on TLC — posed for a selfie together while attending a hockey game in Boston, Mass. on Thursday, April 14.
Sander, 24, shared the post to his Instagram Story, while tagging his younger sis and a couple of their friends as they watched the Boston Bruins play the Ottowa Senators at the TD Garden.
Earlier this week, Sander shared another story to his Instagram to document his workout with Jazz during his visit, as the digital marketing expert has been trying to help her shed some pounds following her weight gain over the past couple years.
As OK! reported, Jazz, 21, has been struggling with her weight as a result of her binge eating disorder, which she openly chronicled on the latest season of the reality series.
Sander, along with the rest of Jazz's family members, were brutally honest with her in the most recent episodes, telling her that she is "not healthy" with her current body weight.
Jazz previously admitted to feeling "fat shamed" by her family, who tried getting her to change her diet and exercise routine throughout the show.
But their efforts seemed to have the opposite effect, as Jazz eventually claimed the pressure to lose weight was "negatively impacting" her mental health. (In addition to her binge eating disorder, Jazz also suffers from depression and anxiety.)
"It does feel like I'm being put on the spot, having my siblings talk at me instead of to me," she said in a confessional on the show, as OK! learned."And I know everyone wants to help out but it's just such a personal struggle to break this cycle of negativity."
Jazz and Sander even got into a heated fight during the season, with the social media mogul telling his sister she was "making excuses" about losing weight.
"You're the one lying to yourself," he declared at the time, causing Jazz to admit she wasn't feeling very motivated and instead wanted to try and lose weight in a "more natural" way.
Since then, the sibling duo seemed to have patched up the tension in their relationship, with Sander frequently helping Jazz stay on track with her exercise routines without pushing her too far.