When a parent becomes a grandparent, a series of chemical reactions take place in the human brain. This release of hormones (endorphins, oxytocin, etc) is known to contribute to what is generally referred to as “The Grandparent Effect” – grandparents doing whatever the hell they want with no regard to consequences all in the name of love.
Obviously, I’m joking, and I fully appreciate the amazing love Grandparents give. But the hormone cocktail would help explain some of the bizarre grandparent behavior I’ve both experienced first-hand and heard about from friends that seems to peak at the holidays. In fact, it’s one of the biggest complaints I hear new parents talking about: “Why do my child’s grandparents think they can do whatever they want with my kid just because it’s Christmas/Chanukah/Kwanza? They should know better!” Or, to quote a friend, “Why are there candy cane flakes in my 8-month-old’s neck rolls?? She doesn’t even have teeth!”
If the grandparents are coming to town this holiday season, you may want to post this list up on your soon-to-be goodie-stuffed fridge. Or better yet, print it out and send it to them anonymously BEFORE all hell breaks loose at the “most wonderful time of the year.” Here’s what I’m telling my kids’ grandparents this winter:

Read more: http://www.mommyish.com/2014/11/25/rules-for-grandparents-at-holidays/#ixzz3K6f8mc2N