Stealing and blocking me on insta?

My husbands family are screenshotting and dropping pictures of our son (ones I take and post) off my story and posting them on their own story with me hidden.

They’re posting the photos I’ve taken with “my boy” as the caption etc but hiding me from it (story)

Now i take so many pictures I find it hard to chose so I do one story and put them on a smaller scale, so they’re screenshotting my story and cropping the pictures they like and they come out looking grainy.

I just find it weird to do that because if they messaged me and went “hey I really like that pic of him could you send it” I’d be absolutely fine to do so, I have no issue. I just find the “sneakiness” of it weird. There’s no issues between us, no hard feelings or anything so I don’t understand why screenshot my stories, crop them and post them as their own with me hidden when all they could do is message and ask for the pic and I wouldn’t mind at all? Wtf