eclipse, since you are talking abt the goyishe courts, you are definitly wrong. as a general rule (meaning all things being equal), the BEST dads can hope for is 50/50. the mom can often get full custody, and perhaps usually does. even if all things are equal. (meaning, for example, two parents equally capable to bring up the kids.) as a rule the courts will give preference to the mom. otherwise, IF the dad’s lucky he’ll get 50.
and if we’re talking about frum ppl, anyways it should be based on the Torah rules not the goyishe court.