i will destroy your bloodline - when you promise to kill every last one of them because they

when you promise to kill every last one of them because they are all the worst kind of dumb

I will destroy your bloodline. Your dad still uses a flip phone.

Your whole family is the worst. I will destroy your bloodline. Your aunt still thinks SpongeBob is a real person.

You’re a total waste. I will destroy your bloodline. Your cousins still think Minecraft is a job.