Margaret Cogan

From her father's will, proved in 1641, we know that she was unmarried and that her father provided well for her. The supposition (below) is that she had some condition that made her unmarriagable.

Ted Sanford:

"We know that Margaret (26) and Susan (21) at the time of their father's death, were still unmarried which is unusual given the short life spans of the time. The fact that Margaret got the largest amount of the inheritance at 300 pounds may suggest that she had some illness or other condition that would preclude her getting married, and that provision was made for Susan should her brother die without issue although she was still marriageable in 1641."