Grandfather needs help with medical expenses

My dad needs our help! He is 63 and he works with mentally challenged adults at a group home and absolutely loves what he does. He has been doing it for the past 15 years! Unfortunately he's been hit with some pretty severe medical problems the past couple of months that has caused him to miss a lot of work. He now has to have a pretty big surgery next week to have part of his intestines removed so he can hopefully get back to a normal life. He lives paycheck to paycheck so missing work has taken a really hard toll on him financially. He is now in jeopardy of losing his apartment and is unable to pay all of his bills because his medical expenses keep piling up. He's been through a lot and still has to miss more work while he recovers from his surgery. Please help him with his medical expenses and help him stay in his home. Any little bit helps!