Shoild I let it go?

Over the weekend we had hubby dad and step mom watch our son so we could get upstairs rearranged now that he's crawling and on the go all the time. I gave instructions on what to feed him and asked for step mom not to post anything on Facebook as I don't trust it. Later that night I had seen that she posted 2 pictures. I gave benefit of doubt not seeing not since it was right after he had gotten there. But then I see a video later in evening of my son. At that point I knew one of them had to have seen note and I flipped out. Thankfully i worked midnight and there was nobody around to hear it. When we picked our son up yesterday, she asked if it was ok that she posted! It's like a slap in the face that she blatantly ignored my request not to have him on fb. I felt like she did it on purpose to see what I would actually say. It caught me off guard so much that I say it was fine but in a tone that ment hecks no! Then she proceeds to tell me that while they were at a bday party for her niece she dipped his paci in ice cream for him to taste (he's 7 months old and just starting to like purée foods). Also that my father in law didn't want son to crawl around on their floor because idk exactly why. Then I see a bottle of infant Tylenol on the window ledge and her saying they went to look for orajel. Orajel is one thing to me but to have pain medicine there when they don't know how much to give and probably wouldn't have asked either of us is kinda like them saying we'll do what we want with him he's our grandson and you can't do anything about it. Sorry for being long but it really has me questioning if he will stay overnight there again. Should I let it go since it was first night or say something now? Thanks in advance.