Just in case you thought the second one was, er, well, anomalous (as in deviant):
Nurturing families come in many forms, and children may be raised by two parents, a single mother, two mothers, a step-mom, a grandmother, or a guardian.
Nurturing families come in many forms, and children may be raised by a father and mother, a single father, two fathers, a step father, a grandfather, or caring guardian.