How should i potty train my son. Mostly he does pee and poop in bathroom but sometimes he does pee and poop in his underwear

A. You to constantly keep reminding the child that whenever you feel pressure for urine or motion you immediately have to inform me or immediately just run to the washroom so this is going to help and if your child is not able to sit on the cupboard Board buy a potty seat for the child like a small commode which is comfortable for the child to sit on its own