What do you all think about stubborn and ungrateful kids that don't listen to thier parents , and parents that allow it?

So I went to great wolf lodge with my girlfriend and her step mom and sister. Her sister is 15 and autisc , just putting that out there. But from a young age the mom , never punished her and just gets her whatever she wants when she wants it. That being said we have an okay time but towards the end her step mom rushes me and my girl to leave the pool because she wanted to go home so we did. That was at 2 pm then we had to sit and wait 3 hours she her sister could finish a quest. Now we're leaving , I'm big and have long legs so I wanted to sit behind my girl and her sister freaked out because she wanted to sit there. I tried to explain to her why and she just freaked out so I moved. But why can't she stand up to her daughter and stop just rolling over backwards for her. Children can't always get thier way. On top of that she is so disrespectful to her mother
What do you all think about stubborn and ungrateful kids that don't listen to thier parents , and parents that allow it?
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