Is it weirf my fiance offered to take my nephew potty?

My fiance offered to take my 2.5 year old nephew potty. He is potty training and his parents were there. But my nephew looked like he had to pee and my fiance casually asked "do you want me to take you potty?". He has three kids of his own. And I've never noticed anything weird at all. I also have a daughter so I definitely paid attention and reflected heavily on all this just for her protection before i moved forward with him. Like I'm not oblivious. ​​but my brother is now claiming that my fiance may be a pedo. I brought this up to my fiance and he was like shocked. He said he was just trying to be helpful and never thought it was weird. But now that he knew my brother was uncomfortable he never asked anything like that again! I have other nephews that he plays with. They all like him. Hes never again offered any potty things with them either. Hes hyper aware now. But I'm over thinking.... am I wrong for this? Is what he did normal?