When you have given ALL knowledge and sadvice available to you - then you have done all you possibly could to help
It surely is safe to assume that you gave to complete teachings of love to your cousin - and if he has no computer of his own at home - then even a complete print out ... hence he knows ALL the rules and has a COMPLETE recipe for his entire spiritual growth until the end of his present incarnation. also be sure you have included any family members living WITH your cousin or any person needing and seeking help.
doing so is sometimes all you can and need to do - it is the responsibility of the one in need of help to accept the advice and convert it into changes in his own life.
sometimes it takes years or decades to totally change a person ... just look at yourself - never expect others to progress faster than you do.
the single most important part of help is to provide help when asked for help. helping those needing help without asking for may often be wasted efforts. make sure you always KNOW and are absolutely sure you have done ALL you possibly could have done.
love and bliss
hans