My uncle has a business and I'm considering doing something to ruin it.
That's awful! Why do you want to hurt his business?
Because the business I work at is in dire straights. So, I want him to suffer too.
I think it is very wrong to try and hurt your family on purpose. Just because your workplace is struggling doesn't mean you should force that on someone else. You should support them no matter what. Otherwise they won't like you anymore and may exclude you from the family.
I'm only thinking about it. I don't know if I will actually do it.
Even considering doing it is not right. He is your uncle, and you should be trying to help his business instead of hurt it. It's best to focus on improving the business you work at instead of trying to hurt your uncle's work.