You may have to put them down as a part of your employment history, but when don't use those employers as references.  Most applications will ask why you left a job, just put personal illness, as you quit and weren't fired.  You have a work history which trumps references in some cases.   People quit jobs to go to othe jobs for all kinds of  reasons.  They may only be asked to verify that you worked there and nothing more about you personally.  Make sure your interviewers know about any physical limitations you may have.  Use your parents, sister, grandparents, etc.   Your parents may have neighbors or close friends who don't particularly know you, but may "vouch" for you on association with your folks so that you can get a job.  They just need to be able to say they've met you and you're a nice guy, not that they particularly know you.  Anyone can say something nice and most people aren't going to say something nasty about a person they don't know very well just to prevent them from getting a job.  It's just a general impression of you in case anyone asks.  I don't suggest separating your sister and her husband as different references in case someone does check up on them.