I picked up my kid from my mother-in-law, an amazing woman with infinite energy to devote to helping me, and noticed his hair was... different.
"Oh, his hair was poking him in the face," she said, "so I cut it a little."
The hair that I'd been growing out for months was gone, and his bangs were crooked. He had a very bad bowl cut. In anticipation for our upcoming vacation, I'd been growing it out so that I could cut his hair (or get it cut professionally) before leaving on the trip, so that he'd look like a dashing toddler in our vacation photos. He has very thin hair, and finally has a nontrivial amount of it, so growing it out was important in making his head look full.
When I heard that she'd cut his hair without asking me, inside, I was mad. But I said, "Thank you," because my mother-in-law's culture prevents me from expressing criticism of an elder.
For me, I feel this was an overstepping of the boundaries. It's my kid's hair, and she should have at least asked first, or, even better, gently suggested that I cut his hair, if it was indeed poking him in the face (usually I brush it to the side so that it doesn't bother him).
Now he has terribly short, crooked bangs, and I'm upset.
What about you -- is it OK for your MIL to cut your kid's hair? What would you do?