Collin Gosselin got a heartbreaking reminder of how his siblings still have a close relationship with their mom, Kate Gosselin , after his sister, Alexis, joined her mother in an adoring video, RadarOnline.com can reveal.

The 21-year-old popped out from behind a door while Kate, 50, was making a TikTok post about her work lunch, giving her mom a hug and a kiss. It came a day after Collin wrote about being "forced" to go it alone in life without four of the siblings he was born with. Article continues below advertisement

Alexis' Rare Appearance

Alexis was the first of Kate's eight children, whom she shares with ex-husband Jon Gosselin, to make an appearance on her mom's TikTok channel, which the former Kate Plus 8 star launched on July 13.

While Kate was putting together

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