I don't think a director should have any kids. I don't even think it's good for your physical health. Even guys in their 30s look exhausted because directors never get enough sleep. What I do is stressful enough.
Most of the top actors and actresses may be working in ten or twelve films at the same time so they will give one director two hours and maybe shoot in Bombay in the morning and Madras in the evening. It happens.