Is there someone in your life that has a lot to say about your parenting style that you didn't really expect to ever critique it?

Just thinking about this today because as I was chatting with my dad I mentioned we are pulling our middle son out of his part time preschool and I was surprised when he made a comment to the effect that we never should have put him in (he is 2 and it's only 6 hours a week). He has also made several comments about my kids' diets, breastfeeding, sleeping, and rear facing in the car seat. I never expected him to have so many opinions because he was very hands off when I was little.

So who has surprised you with their many opinions?