We used to play on the nearby play ground those days with 1/4 for girls to play some of their girlish games & we with football.
We boys all had sisters & that also of same average age .They played with their dolls,we played football, simple no one came in no one's way , no one gets hurt.
One day,I saw from a distance they had some argument but was unable to hear because of the noise after some time they started to fight . I immediately ran & stopped them. On asking I found it was all about the doll ,they were comparing their dolls & slowly the talk turned into an argument.