>>85490783if you take the average household with two children, there are 3 possible setups
-2 guys (25%)
-1 guy 1 girl (50%)
-2 girls (25%)
since your chuuba is female, this eliminates the first outcome
you are left with
-1 guy 1 girl (67%)
-2 girls (33%)
this means she will have a brother twice as often as a sister