A. How many children are in Mary's family?

The text states Mary has two brothers and two sisters, totaling four siblings. However, the question asks about children in Mary's family, implying her siblings. The provided answer 'two' likely refers to Mary and one other sibling, or perhaps the question is poorly phrased and refers to Mary's parents' children excluding Mary herself. Given the options and the circled answer, it's interpreted as Mary and one other sibling, making two children in her immediate family unit as presented in the options.