Is my brother spoiling his child?

Most of the times when my 5 year-old niece throws a tantrum, he ends up buying the doll or toy she wanted, buy her a dress or buying her favorite Burger King burger. She wants that and she gets it most of the times. He just does it to make her stop throwing herself on the floor, crying and screaming so much.

His wife is very upset with the situation. She wanted to punish her but my brother got in the way, told her no. So she didn't and the girl is getting worse. Is he spoiling the child?
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My brother excuses it with ''she's just a little girl, she'll mature when she gets older''. He reads that by age 8/9, most children already naturally settle down.
Is my brother spoiling his child?
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