i think your right here, i wouldnt have pushed the little one to have photos taken she didnt want, and tbh it would be waste of time, certainly no nice natural happy smile for sure. People forget how vulnerable 3 yrs olds are, and maybe she was being over-sensitive, but hey she's 3 for godsake, the grandparents could and should have been a bit more thoughtful in the first place, a few mins chat with the 3 yrd old and taking some pics with both children and then some of baby may well have been all it would have taken for all this to be avoided. MIL's opinion is hers, not yours, your child your call. I do think carolegif has a point about a quiet word with MIL and explain, keeping it light, and hopefully the storm in a teacup will be over. Good luck, its rotten falling out with family.