Look at the family tree again.Who is/are:
1 twins?
2 Bill`s parents?
3 Bill`s grandparents?
4 Mike`s son?
5 Sam`s wife?
6 Janet`s husband?
7 Sue`s daughters?
8 in their late sixties?
9 in his mid forties?

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Twins are Janet and Sue.Bill's parents are John and Mary.Bill's grandparents are Henry and Grace.Mike's son is Tom.Sam's wife is Mary.Janet's husband is John.Sue's daughters are Lisa and Amy.Sam and Mary are in their late sixties.Bill is in his mid forties.