There is never a reason for us children to stop being filial to parents, even after we reverted to Islam.
Parents sacrifice their time and energy just to raise us up from womb to adulthood. Their beauty is doubled up by their efforts in taking extra miles to prepare halal meals, or choose to eat in halal restaurant with us. This is indeed another great reason for us as Muslim children to be extremely grateful of.
All praise to Allah, the Turner of all hearts. May Allah guide them into Jannah with Hidayah key.