A, B, C, D, E, F and G are seven members of a family belonging to three generations. There are two married couples—one each of first and second generations respectively. They travel in three different cars P, Q and R so that no car has more than three members and there is at least one female in each car. C, who is a grand daughter, does not travel with her grandfather and grand mother. B travels with his father E in car Q. F travels with her grand-daughter D in car P. A travels with her daughter in car R.
How is D related to E?