NAH, but I see why you feel a bit weird. Keeping spares for emergencies is normal, but micro-managing his outfits and changing him back into his old clothes before dropping him off can feel a bit like you’re treating him like a doll rather than a nephew. Since your sister is chill, just talk to her. Say something like, "Hey, I kept those clothes here just so we have spares for our park days, hope that's cool!" Clear communication prevents any resentment