Family problem. Be the correct decision?

My father died 3 months ago. he was a bipolar patient since I was 20. mother is schizophrenic since I was 3 yrs old. I am the only daughter. I am married now with a 11 months old baby. Problem is my in laws stays with us. I want to keep my mother as well with us but my husband doesn't want her to stay with me because of her disease which is irritating most of the time and which also can make everyday's life difficult. He is okay with her staying in a different flat in same building. Pls suggest what to do. I dont want to keep her alone as she has mental problem and she will definitely feel this is unfair to her if I keep her alone in a flat. Also keeping her with me can create problems with my husband and in-laws as she has problem of mood swings and when gets irritated she says something which might hurt the other person. And I am pretty sure my in-laws are not going to understand that at all. What will be the correct decision?