Helper posting home videos.

[Romika]

Our Auntie/ helper, who is great, is posting videos of herself on FB in our home changing sheets with captions like, ‘BBQ done, they are having a swim, time to change the sheets.’
its jot ideal, Can I ask her to cease?

She's employed by you? And also your aunt?

Yes, you can ask her to stop filming in your home.

Is she actually an aunt of yours? If she's related and is helping you maintain your house you'd be best to stop that arrangement and look for paid help

If she is paid help and not actually a relative and you just call her "auntie" for whatever reason, then yes tell her to stop filming in your home for privacy and security reasons. If she continues, end her employment and find someone else

Yanbu as it's your home so you decide if people are allowed to record there.