The amount of "just ten dollars" is very small, suggesting that although it brings you trouble, it won't make you feel sad, otherwise you will dream that more money will be torn off by the other party.
What's your usual impression of my cousin's children? Is it noisy or good? Besides, what's your impression of your cousin? Because you have provided a little less background information about this dream, there are two explanations for who is bothering you:
A This person is your cousin's child. You dream about him directly.
B this man is a cousin. Although you dreamed of a child, the child was a cousin. In the dream, it can be extended to explain that your cousin's behavior makes you uncomfortable, which leads to his children tearing money in your dream.