i can see that in the english server there are 3 prizes but in the russian one 5 prizes. Is it ok if we post videos also in the russian one?

Hi, I made a video for this contest. My cousin also wants to participate. I invited him a long time ago. His username is very similar to mine (a joke between us). is it ok if he also takes part in the contest? I mean, is it a problem if he is my relative?