Taking sole care of two children, aged 1 & 4, is also contraindicated if you are obligated to be performing your full-time job.

Oh for Pete's sake...I'm a woman department head. I'd have no choice but to terminate any member of my staff (male or female; there are 4 of each) that was letting their family obligations interfere with their performance.

If their performance is hampered by their need to parent during work hours, they are "less than" an employee (male or female, mother or father) who isn't.