looking for a story where a male protagonist works hard to raise his siblings

Sorry, um, what genre exactly?
Dunno if this is what you looking for but try this (yaoi)

http://www.mangago.zone/read-manga/saa_koi_ni_ochitamae/

http://www.mangago.zone/read-manga/ezakike_e_youkoso/
(it's not completed though, sorry)
http://www.mangago.zone/read-manga/ouji_hiroimashita/
(this one is ^*^)
I hope this is something you wanted

any genre is fine