first 3 wks of PTP - confinement wks. but if there is a public
holiday during that period, he will get to book out. the parent
visit is usually scheduled on the 2nd weekend if there are no
public holidays in that period.
subsequently he will get to book out every weekend.
he will transit into bmt after ptp. however if he passes any of the
disruption IPPT tests during ptp, he will get to leave ptp, and
will not need to go back until bmt starts.
yes he can go overseas. but since he has registered for ns, i think
it is better to find out if he needs an exit permit to do so.