Leagally, what do we do with stuff that belongs to someone who is in prision? The house is selling.?

Long story short, My ex-husband went to prision (again), he was living with my ex-mother-in-law at the time of his arrest. My family is the closest relatives to my ex-mother-in-law. My mom had to get Power of Attorney over her, and admit my ex-mother-in-law into a secured living facility because she has been diagnosed with Dementia, and was a danger to her-self. My mom is handicaped, so she couldn't care for her. My ex, is being charged with elder abuse, for stealing over $70 Grand from her. To pay for my ex-mother-in-laws very high living costs, we need to sell her estate, which includes her home. Now I'm wondering what the hell do we do with his things? Nobody wants to store them for him or pay to have it stored, but can we do that leagally?

They want to do a quick sell on the house, because we need the $ ASAP. He left her with negative funds in her account and mulipul unpaid bills (yes he's a meth addict), and my mom was able to find a CD with $10,000 to bring her account positive and pay her outstanding bills. Do we have to evict him?

From a legal standpoint, all you can do is put it in storage, and charge him the storage fees.

If you get rid of the items, he could sue you... but I doubt he would. Even if he did, any award he won could be used for restitution for what he already took from her.

sell it give the money to her.

If you were to put it in stoarge, you'll be out stoarge fees until if and when he pays it.

If I were in your shoes-Since nobody wants it, sell it, give it away, do whatever you want with it as long as you just get rid of it.

My 2 cents: Provide him with written notice that he has a reasonable amount of time (eg. 30 days) to arrange for his possessions to be removed. If they are not claimed on his behalf within that amount of time, they would be considered abandoned and you can do what you want with them. The law in your area might require a longer time, maybe 6 months but for sure no one has an eternal obligation to keep it for him.
Maybe you want to make sure that none of the stuff is stolen before you try to sell it.
(PS Just a hunch but seeing as how it was his mother's house, I'd bet big bucks that you'll find more stuff hidden - maybe for years -in hard to find places somewhere. In which case, he likely will try to get someone to retrieve it for him once he knows you're selling the house)