During her 40yr marriage my father in law worked while she pioneered. ..... alimony? divorce settlement?
depending where you live you want to be careful you dont get stuck with her medical bills too.
if you divide the hoousehold outgoings between the adults, it may also be an idea to get a list of rental costs for properties in the area as well.
that way you can show a comparison to how much renting a place costs as opposed to the split.
the only thing with dividing the costs, it may make her feel like she's got a permanent fixture. she may be physically capable of work now, but can
you afford to keep her for years if that stops.
if theres a waiting list for assisted housing of any sort then it may be worth getting her name on it now.