The story about my great-nephews 'other' grandma isn't really a nice one and it makes me mad just to think about it, but fortunately they don't see much of "Knock Knock" any more!
My niece married the second most worthless man on the face of the earth - (I married the first)! He's completely irresponsible, has never supported his children, he's abusive and very in to drugs and alcohol. Thankfully, she came to her senses, divorced him, and is now back with her two little boys living with her parents (my brother and sister in law) The oldest is 3-1/2 now, little guy is almost a year old. But if you wonder how this paragon of manhood got that way, you should see his mother! For lack of a better term, his mother is the town drunk! She's been arrested dozens of times. When she gets fired up she goes to people's houses, pounds on their doors, and wants to start a fight. She was arrested for going to a former sister in law's house and trying to attack her because she resented it that the former sister in law was still going by the last name of her ex-husband ("Knock Knock"s brother) - that she divorced TEN YEARS BEFORE! So my niece's older boy still remembers his drunk grandmother showing up at their house, sometimes in the middle of the night, and pounding on their front door - so he refers to her as "Knock Knock" - he's scared of her! His "Grandma" that he loves and relies on is the one he lives with, my brother's wife.