I think that since you live with them telling them might be a good idea actually. It may be hard and you may get some comments you don't want but what if at some point you need hospitalization? I hope you never do but that would be a very, very difficult point to just be revealing the illness for the first time (I know because while I lived away from my mom I was told that in one week I would be admitted and I had to ask her to take care of my cats. Then I wasn't admitted but had told and while I've heard some dumb comments and one person in particular in my family doesn't get it at all, at least I never worry about when I have to tell what.)

There also was a time that my therapist pushed very, very hard for me to bring my mom in to talk about suicidal ideation. When she first heard me say I was at risk she told me I was not. I had been very suicidal for many months and had been hospitalized with a plan. So we had a therapy session about how that part of my life is handled but that she needs to know about it. (Because I live beside her and she helps me as needed).

You don't have to say that much. But just so that you don't wind up in a weird place in the future I would find a way to say something.

They may even know something already. Plenty of people did about me and I was quite good at hiding it most of the time. I think some people are just sensitive to MI and pick it up more easily and are more empathetic than others.