Sorry for your loss. From what I know, if the boy didn’t have Brahma yagnam, there is no thevasam for the kid as he has not been inculcated into the gothram formally. You may check your house Vaadhiyar as well to confirm.Thanks for your reply. I am already doing what is suggested by you.
I had some doubt whether I have to perform any religious ceremony besides charity to deserving young man.