I think it's both the one who's kidnapped and the kidnapper at fault. Of course, everyone knows why it's the kidnapper's fault, but the one who's being kidnapped should know responsibility and when a stranger approaches him/her they should scream 'help' as loud as they can...at least that's what my parents taught me. So, this brings me to the point that it's not just the kidnappee's fault, it's also his/her parent's/s' fault/s (if they're under the age of 17). The parents should've taught their kids what to do when a stranger approaches.
Anyways, other than this, I hope your cousin will be found soon, shiek.
°º¤ø,¸¸,ø¤º°`°º¤ø,¸ÇHïÑ€§€ ®€Ð ð®åg¤ñ ßåßë°º¤ø,¸¸,ø¤º°`°º¤ø,¸