Should I marry from 'wrong tribe'?

I am in a stable relationship with a woman who is from a different tribe. My parents have been pushing me to get married and bear them grandchildren but when I introduced the girl I want to marry they objected, saying that her tribe is promiscuous, money-minded and that they take their children if the marriage fails or if they want to leave their matrimonial home. I have sought advice from friends who have confirmed that the marriage may not work because of the difference in our cultures and the perceptions of women from that tribe. I am confused because I love her and she is the one I want to marry. I am thinking about ignoring the advice and following my heart but my parents’ strong sentiments keep haunting me. What should I do?

{Wekesa}