I need help on behalf of my mate

So, my mate is a “Hypixel SkyBlock” pro. (As he says) I have barely touched Minecraft and usually play CoD with him. One thing about him is that he is VERY lazy. He told me about how he was going to get “Farming 50” However, one day he told me he got my sister to farm for him. I was told that she had “Very Safe and Fair” work conditions. I thought this was a joke as his sister is the type to only accept 50 feastables bars an hour as payment. Today, he told me that his sister dropped all of his items while farming, including his “Necron” which he grinded months for ( according to him) What do I do? My initial plan was to jump his sister.