According to Peter's family tree,

The Family

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
According to Peter's family tree,

1 Bob is .
2 Frank is .
3 Julia is .
4 David is .
5 Susan and Mary are .
6 Frank and Jemmy are .
7 Betty and Louis are .