No one can submit on any body else’s behalf. It means an applicant acting as X cannot apply on behalf of Y. (except as parent of a minor). One can though help in filling the application with all the details of the applicant.Specifically one cannot specify that s/he is applying on behalf of her/his mother/father/brother etc. The person in whose name the application is made shall have to appear in PSK himself, give own biometerics/picture etc.