SIL got married 3 months ago. Her husband ( my BIL) got added to family whatsapp group where we frequently share our 4 month old baby's photos with PIL. We have an understanding with PIL to not share our baby's photos on any other means of social media, as we value our privacy.
Today BIL photoshopped an old photo of our baby for Holi celebrations - her whole face is painted blue and Happy Holi is written on the photo. When I saw the photo I got quite pissed off someone edited my sweet baby's face. Before I wanted to address it, FIL already wrote he loves the photo and put it as his profile pic on whatsapp (that's another thing I'm not too happy about, but I let it slide for now).
DH saw this and asked his sister to tell her husband to not edit the photos as we are not comfortable with that. SIL sees no harm in this and now is not replying to DH's messages.
So the whole question is AIBU to address this and ask bluntly on the family group to stop editing the pics?
Just to add - I have met BIL once, it's an arranged marriage, so want to go about this in a sensitive way as I don't know him well and don't want to offend him because he must have meant well.
DH thinks I should let this go and we should just stop sharing any photos of our baby. I think I should address this, but unsure how not to cause a family argument