Kids are scary

My 7-year-old nephew asked me " tumhare papa chai peete hai ya dudh?" and I said " bade log sirf chai aur coffee peete hai, tum baade ho jaoge tab tum bhi peena" and then he went like "mere papa toh meri mumma ka doodh peete hai". The worst part is his mother( my cousin sister) was in the room when he said that and she's one of my favourite cousin. now she's been ignoring me and specifically told my mother to not bring me to her son's birthday party (I had already brought a dress for it).I am so hurt, was it even my fault? I indeed can't look at my jiju and didi the way I used to but abb kya hee kar sakte? she requested me not to tell anyone tho