Srila Prabhupada told how even his own mother used to eat with her left hand. In Indian culture you only eat with your right hand, but she took a vow that she would use her left hand until her son notices-means he himself, when he was a young boy. So that may seem like some superstition, but in the Vedas it's said that the first guru is the mother.
Lecture on "Vaisnava Culture" – 13th Oct 2000