Jayakumar is the eldest son of the late eminent film director M. Krishnan Nair and K. Sulochana Devi. He has two younger brothers, K. Harikumar and K. Sreekumar (K. Sreekuttan), the latter being a popular film director himself. He is married to Meera, and has two children - a son named Anand and a daughter named Aswathi.
