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Sekhon
Caste's SHOULD NOT be issue in Sikhism. However, I can totally empathise with you. When my parents were looking for a spouse for me it was imperative that he was of the same caste. Then they would consider the other factors.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-youth/14462-caste-system-in-sikhism.html
I knew then that this was wrong, but had no references to show my parents. However, now they realise they were wrong and admit it was nothing more than mere pride and a matter of social class.
Please read on the link as it will provide you with quotes from the Guru Granth Sahib and your parents cannot refute this. I don't know how much you "practice" Sikhism (if this is the correct terminology to use), but don't use this particular teaching about Caste etc just to win a battle with your parents. You will be contradicting yourself, if you use the Guru Granth Sahib to show your parents the "correct" belief and then dismiss parts of yourself. Besides your parents won't take you seriously. I'm talking personal experience here. I told my mother-in-law about not consulting a pandit for Janam Kundli as it goes against the beliefs of Sikhism. Her reply...so does drinking and smoking. Yes, looked like a prat!
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=14462 http://www.sikhphilosophy.net/sikh-y...e-require.html