Renter Running Business From Home - Eviction

[Kenneth Woodall]

My brother has a rental property and has a difficult tenant who runs a home based business. It's an online shop with inventory scattered everywhere. He would like the tenant out (for many reasons) but the tenant wants to stay. 

There's no terms on the lease explicitly prohibiting home-based business, but there is no permission given either. The business is likely unlicensed but I don't know if that matters for this type of business (etsy-type crafts). 

Would this be grounds for eviction? Or could he submit a 7 day notice to have the tenant stop doing their business from home?

Or are tenants allowed to run home based businesses like this without permission? Any insight is much appreciated.