Elon Musk‘s daughter’s poking fun at her strained relationship with her dad … releasing a clip about claims that she has a new half sibling — and, sharing how she found out the news.

Vivian Jenna Wilson — Elon’s 21-year-old daughter with his first ex-wife, Justine Wilson — posted to TikTok this weekend about the alleged child Ashley St. Clair swears is the tech mogul’s.

Watch the clip … Vivian mouths along to audio from the TV show “Phineas and Ferb” — basically saying that it’s strange she’s now learned about two new siblings from Reddit instead of her own family.

Of course, Elon and Vivian aren’t on speaking terms … remember, during the summer, Vivian — who is transgender — went scorched earth on Musk who claimed she transitioned because of the “woke mind virus.”

Vivian claimed Elon was never much of her father to her … and, despite his retelling of times they spent together when Vivian was a kid, she says they never had much of a relationship.

In fact, just last month Vivian claimed in an interview that Elon berated her for being queer and never really supported her at all.

ICYMI … St. Clair — who has appeared as a guest on Fox News — took to social media to claim she was having Elon’s latest child, his 13th.

While many on X have — including controversial political personality Milo Yiannopoulos — have questioned the validity of her claims, Elon bailed on his social media presence … claiming he’s getting offline to work on a new coding project.