How to handle annoying nephews?

They are so irritating, I do love them but sometimes I want them to leave me alone. They constantly kick me and punch me, they do jump on me and hit me in the stomach. They're 6 and 8 years old. When I kick them back or do something back they start crying and screaming like they didn't just bruise me. I don't know what to do I honestly I'm so tired and fed up of them. Then they just follow me around whispering to each other 😐
How to handle annoying nephews?
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