Oh my word it'd be like being god.
I'd have them live out the lives I want to live, but can't, simply because I can't stretch myself but so far. They'd take professions on a wide variety of subjects I find interesting. I would watch them grow, develop, and become individuals of their own. They would be me at a genetic level, but no longer at a mental level.
I would watch them make friends, fall in love, have their hearts broken, watch their dreams achieved and shattered. In forty years we'd all gather again and it will be like meeting intimate strangers with my face. I would die happy, knowing that I had achieved all I could have ever hoped for, and more, within the reasonable span of a lifetime.