That's happened in our family. One of my husbands sisters passed away a few years ago and left 2 girls under the age of 3. Needless to say they got everything. That's ok. But now they are 14 and 12 and are spoiled little brats.
They talk back and bad mouth everyone. But Grandma still thinks they are little angels. We just stay away and only get together with them when we have to.