If your cousin won;t pay tell your parents or you aunt and uncle
This is way to much
It wouldn't help, either way. I'm twenty-three and my mom and step-father don't care anything about horses and have only helped me with my horses twice, when the vet bill was too high for me to pay by myself (aka, several hundred dollars).
Out of the two uncles I have, neither would ''take my side''. The uncle whose pasture I'm currently using would laugh and crack jokes about it, and the other uncle (who I don't get along with) would immediately take my cousins side, as she's his daughter, and would get upset at me for some irrational reason or another and would pitch a fit.
My family is... well... different.
There's my great grandmother, who I live with. She owns fifty acres of pasture, and I used to keep my horses in that pasture, but due to issues cropping up with her oldest son and his kids concerning my horses, I moved them. She's in her seventies and doesn't like getting into screaming matches with her oldest son over stupid things, and she doesn't need to be stressed out over things like than anyway.
Then there's my great uncle David and his 'brood'... (his daughter and two sons and their families). David and his 'brood' are the ones I have so much trouble out of. He thinks he owns my great grandmothers pasture and it's 'my way or the highway' with him. His kids and their kids are the same way, and he in particular really doesn't like my gelding... to the point of threatening to kill Dakota at one point... Needless to say, that an a lot of other issues with the people who hang out at his home messing with my horses... I moved them. So yeah, he definately wouldn't help any, he'd just get upset and scream and yell.
Then there's the great uncle whose pasture I'm using and his side of the family (a son and daughter and their respective others and kids). They stay out of the way when it comes to family arguments and are neutral in the whole deal. My great uncle Mann lets me use his pasture without paying him board or anything, but because I want my horses at 'home' and not on another road, even though it's close regardless, I'm fencing in an area behind the house. Mann is great, but he's not a horse person and would just joke about it and tease me over it.
And my mom and step-dad would literally just tell me that it's not their problem. They don't even live out here, anyway. They live in town and don't like the country and don't like to deal with anything from the country. -_-
The only great uncle I had who would have not only seen my side of this issue, but would have also made my cousins fork over the money the day it happened, etc... was my great uncle Doodle (a nickname, obviously, lol), but he died back in 2007.
Sorry for the novel, just trying to explain my family a little better.