She would have 5 more brothers than sisters, right?Method: Plugging in numbersScenario 1: Jakob has 1 sister (he has to have at least 1 since Sari is his sister), meaning he would have 4 brothers.Sari would then have 0 sisters (she's the only 1) and 5 brothers (Jakob + their 4 brothers) = a difference of 5Scenario 2:Jakob has 2 sisters, which means there are 5 brothersSari would have 1 sister (she would be deducted from the sister category) and 6 brothers (Jakob + their 5 brothers) = also a difference of 5.Hope that helps!