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One way to help make the transition easier is to find options that are within budget for her if she will have trouble doing this herself. Go and view them yourself before you take her to see if they're her taste.  Make it close to you. That way, she won't feel like you want her out of your life completely. Don't decide for her. Even if she needs some help with care, it should still be her decision where she lives, unless she can't decide at all. Many families are in mult-generational housing, which can take on many forms. One option is having a separate apartment for your mother-in-law, so she has her own space. If that's the option you choose, you'll need to find a new house that has this option.  In this instance, she'll still be close by, but you can have more separate lives. It can also help alleviate the guilt your spouse may feel about abandoning his parent. If you are being the caregiver for your mother-in-law, the next option may be independent or assisted living. These options allow your mother-in-law to have some independence, while still getting the care she needs. The problem is these options can be very expensive. Nonetheless, if your mother-in-law has exhausted other options, Medicaid will often pay for some form of assisted living.
Find a place for her to live. Consider a house with a backyard apartment. Look at assisted living.