Intercast is something that is very important in Nepal to avoid racism. I am bahun, got married to a newar girl. Getting married to another caste can have some difficulties in the beginning because of family restrictions. Remember that your parents is one generation back to you. So they might not have same view as you have. You are one who need to prove them that intercaste is something very valuable. believe me, intercaste relationship teach u lots of intercultural stuffs. You just need to be confident in your love and relationship.