Alice
type: NamedIndividual
type: Person
has father: Bob
has father: Robert
ssn: 987-65-432A

Bob
type: NamedIndividual
type: Person
ssn: 124-35-6789

Calvin
type: NamedIndividual
type: Person
birth date: 1956-06-25T10:00:00+01:00

Robert
type: NamedIndividual
type: Person
ssn: 123-45-6789