In Illinois, can a mother refuse to give the child's father the child's social security number if neither has full custody.?
My fiancé needs his daughters social security number for medical purposes and the mother refuses to give him it. Can she do this if neither has full custody of the child and both sees her equal amount of time.
First, in IL an unwed mother has sole custody until a court says otherwise. So, if your fiancé has not established his custody rights in court he should do so.
Of course mom can refuse to give him the child's SSN. If he wants it, he needs to take his copy of the birth certificate and march on down to the nearest SS Office and get his own copy. If he is not on the birth certificate then he needs to file to establish paternity.
On the off chance that you are deliberately playing games about his reason for wanting the number...the IRS has its own definition of custodial parent that has nothing to do with court orders and everything to do with where the child sleeps most nights. If he doesn't meat the IRS's definition of custodial parent he doesn't get to claim the child, PERIOD, unless mom releases the exemption to him by signing form 8332.