Question 1074538
"Each child has at least 4 brothers"
means that for each boy there are 4 other boys that are his brothers,
so that there are at least {{{5}}} boys in the family.
"Each child in a family has at least ... 3 sisters"
means that for each girl there are 3 other girls that are her sisters,
so that there are at least {{{4}}} girls in the family.
The smallest number of children there might be in the family is
{{{5+4=highlight(9)}}} .