I have a client who barely stopped her kid from stealing $90,000 out of her savings account. The kid told his mom that he needed to be listed on the account for when she passed away so he could handle her affairs. She's in good health, early 80's, and relying on that money for whatever may come up before she dies. While meeting with the bank to put his name on her account, the banker explained to her that her son would have full access to the money and he would be able to use all of it whenever he wanted. That's not what she was told by her son before going to the bank, and she realized that her son had lied to her. She changed her mind about putting him on the account. I was at her house when her son started calling her and screaming at her over the phone about not being able to get "his" money, and that she didn't need it. He had just returned from an overseas vacation that she told me that she didn't understand how he and his wife could afford going on. That was before Christmas, and I haven't been back to her house since then, so I don't know what the final outcome was. It just struck me as a really horrible thing to have a kid that wants your money so badly that he didn't care if she had enough to live off of or not.
I'm not saying this is why the siblings want to cash out on the house right away, but I'm also saying that you never really know where somebody is financially based on how they are living.