Thanks for putting up your problem at Healthcare Magic!
The pin worm are notorious for recurrence.
Recurrence can be due to incomplete treatmemt, treatment failure or reinfection.
All the family should take the treatment in the same pulse.
400mg at bed time for three days.
Do not take sugar containing foods from the previous day to next day.
Pair the nails, wash hand before anything you eat.
The problem will resolve surely with these precautions and treatment.
I hope the advise would be helpful for you.