'Private' social network Everyme (YC S11) takes on Facebook 14 years ago
Disclaimer: I work at Facebook. I share photos and videos of my kid in a secret FB group where I have to approve membership. It has worked pretty well, I'd encourage you to try it!
https://www.facebook.com/addgroup
Alternatively you could create a list of all the people you want to see this content and restrict visibility to that list when you post.