should i refi or take equity out? i own a home alone but my bro. pays 1/2 my apr is 5.3 fixed?

i dont wanna take out money but he does cus of his high debt, what should i do? our payment is 1250.00 monthly and have owned the home for 3yrs, i bought it for 170 and its worth about 300 now please help me or us,