Lmfao my nephew just came in here and said "I'm mad at you" I'm like why? He talking about "cause…

Lmfao my nephew just came in here and said "I'm mad at you" I'm like why? He talking about "cause you fussed at daddy so I'm mad at you!" Lmfaoooo I haven't fussed yet but that did piss me off. He making it like my niece lying and I'm lying to my sis about him telling his 4 yr old to carry the baby. Acting like he just done it on his own. Then my sis believing all his lies. I got to get out of this house