I have not seen the video but here's my experience... I have 3 grandchildren (from 2 children) every single one of them seek me out before their parents when we are together unless they are hurt. My youngest just turned one and she will shake her head no and grab on to me when her mom tries to take her from me. My sister in law has 4 grandchildren and they all prefer her over their own mom when she is around. So I personally don't think this is unusual. Grandmas tend to give almost 100% attention while parents are distracted with day to day life I think.