Are there many people who carry on a vadetta with a sibling without even having a case to support it?

My sister has done it for 27 years.Are there many people who carry on a vadetta with a sibling without even having a case to support it?
The word is vendetta, and no i don't think it reasonable for one to have one against someone without good reasonAre there many people who carry on a vadetta with a sibling without even having a case to support it?
My vadetta has a case rack.
why would you want to? Nobody in their right mind would do it without having a case to support it.