What was the relation between Prophet Ismail (A.S) and Prophet Ishaq (A.S)?

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What was the relation between Prophet Ismail (A.S) and Prophet Ishaq (A.S)?A. Prophet Ismail (A.S) was father of Prophet Ishaq (A.S)
B. Prophet Ishaq (A.S) was father of Prophet Ismail (A.S)
C. Brothers
D. Cousins