P1 Registration

Hi mummys need help on this. My boy will be in p1 nxt year so registration are in july. My worries is currently child is under share custody so care n control is under me the father likely will come to terms that boy will be schooling near to me . So i saw that both parents ic have to be provided, so do i give them my ex spouse ic or my current spouse? Also does my ex spouse have to he there as well during the registration?