Generate 50 different Head Entity and Tail Entity with the given Relation.
Relation: sibling
Relation Definition: the subject has the object as their sibling (brother, sister, etc.). Use "relative" (P1038) for siblings-in-law (brother-in-law, sister-in-law, etc.) and step-siblings (step-brothers, step-sisters, etc.)
Relation: sibling
Head Entity: William; Tail Entity: Alice
Head Entity: