How do you feel about children twerking

Ok so I went over to my SOs sisters house this weekend for a bbq with a lot of their family. She's 23 and has 2 young kids. A couple of us went to the garage and played music and we started dancing with the kids. She had a couple beers throughout the bbq and was getting into it. Then her and her friend started twerking. His sister is a pretty carefree person, she's really bubbly always dancing. Me as my SO were just laughing. Then she started cheering on her 4 year old daughter who began to Twerk! And a couple minutes later her little 2 year old stumbled in and out her hands on her knees and stated bouncing up and down. I honestly think thought it was the cutest thing. My SO was shaking his head but laughing too. What's your opinions on this situation, do you think it's not appropriate for kids? I see it as just dancing using a little more booty. 

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