Have you ever suspected a family member is copying your posts on social media?

I suspect it from someone on FB.
Every time I post a poem, they post a similar one a few hours later on the same theme.
It has happened many times over the years, and it is always the same person.
My family is a bit batcrap, so I am not upset, actually; I just find it a bit odd.
It could be a coincidence, but there's been a lot of them if it is.