So far, I think that only Jeri has mentioned privacy settings?
There is a popular misconception among those who are not familar with how Facebook works that all of your posts can potentially be seen by the whole world at large. Well only if you make your posts "public"! Beyond that, you can restrict who sees your posts (and photos) by specifying "Friends and Friends of Friends", "Friends only", or you can further restrict it and allow only a small group or one person(such as your family member(s)?) to see your posts. You can even specify "only me", but what would be the point of that. My daughter sends us pics of our grandchildren, but would not send to all of her friends necessarily: or she will send by Facebook Messenger or iMessages, which are both more private.

Unfortunately, all of the above relies on no-one to whom the posts are sent either sharing them onwards, or, if 'share' is disabled, copying & pasting them.