i would reccomend just talking to em... seeing what the problem is... explain it to em... theres a lot of multimedia on the internet that could be used if they dont want to talk with YOU. then slowly, start following the rehat more if you can. start with the basics. Tying a Dastar "Pagg", or Dhamalla (in my case, my rentz hated the dhamalla when i was younger b.c they thought it was a nihung thing and it would look "bad" on me and ppl would laugh. I would tie it at home so they get used to it. and slowly in public and people really liked it. I brought out the media, a lot of DDT ( Baba Thakur Singh Jee) Tapes, Panth Rattan Bhai Jasbir Singh Jee Khanne Vale, Panth Rattan Gyani Sant Singh Jee Maskeen, Bhai Pinderpal Singh Jee. these are some i used.
now the whole family (my rentz, me and my bro) all are amritdhari
Ardaas karo that this dun happen
....but if worst comes to worst, theres always a local gurdwara. Find a local Gurmukh, explain them the situation. and ask them to talk to your parents. If still no, then gurdwara is available and local Gurmukhs are always there to help....(something i found out )