A line perpendicular to a marriage line indicates the offspring. If the line ends with either a circle or a square, the couple had only one child. However, if the line is connected to another horizontal line, then several children are produced, each indicated by a short vertical line connected to the horizontal line. The first child born appears to the left and the last born to the right.
a. How many children did the first couple (couple in row I) have?
b. How many children did the third couple (couple in row III) have?
