Hi hammo7
welcome to TP - there's a lot of knowledgeable folks on here and a lot of information, so I hope you have a chance to have a read of other threads.
I'm not entirely sure what your situation is - I take it that you and your wife owned your own home; that you have 2 daughters; that a few years ago you altered the house ownership so that the 4 of you are tenants in common with a quarter share each?
Your wife has Alzheimer's and I guess that you and your daughters were caring for her together - all living in the house? However, now one daughter is no longer able or willing to care for her mother and has moved out, therefore, leaving your wife's care to you and your other daughter.
You say she 'jumped ship', so I guess you are not happy with her decision.
Now you are considering altering the house ownership to be shared between you, your wife and the remaining daughter - though it's not clear whether the daughter who has left has instigated this, or agrees?
May I ask - does your wife still have capacity to understand and agree to such an alteration? Is there a Power of Attorney in place?
Maybe you could let us know a little more as there are members who have knowledge of these kinds of questions.
best wishes