define sacrifice... and define what parents are asking of you...
if they know whats best for you and saying "beta... consider tihs person", then maybe give the person a go.. but if they are forcing it upon you... then thats another story
hmmm in this case its a "marry your cousin" situation. I'd never considered it ever, having been brought up in the western world, I consider it a bit weird.
on the one hand they know what's best for me, but on the other, their reasons a slightly selfish (that if its a girl from the family she'll respect us and live with us but if she's from outside the family she'll want to live separately, will be rude to us - it almost comes off as "if she's my niece I can control her and make her do what I want)