disabled grown up children

Hi my stbx and i are seperated i am living in house in my name i bought 10 years ago when we seperated for a while then got back together we have been married 27 years, our two sons are 25 years and 21 years both are registered disabled the oldest son is a manic depressive and lives on benefits the youngest is at college i am still supportung them emotionally AND FINACAILLY IS MY STBX REQUIRED BY LAW TO HELP ME OUT WITH THE MONEY SIDE OF STILL SUPPORTING THEM ? neither of my sons gets on with there father ADVICE PLEASE , BY THE WAY I WORK FULL TIME AS WELL AS SUPPORT MY SONS STBX WORKS FULL TIME HE IS ON A BIT MORE MONEY THAN I AM