4. Jessica, Grace, Ben, Bill, Sandra, Lily
5. 1. Grace is Sandra and Bills's sister
2. Bill is Grace and Sandra's brother
3. Ben is lily's father.
4. Lily is Grace, Bill and Sandra's niece.
5. Jessica is lily's granny.
6. Lily is Alan and Jessica's granddaughter.
6. is, P, P, P, is, is, P