Late stage of Old Timers Don says, RIGHT.
Most likely both mothers are sharp as a tack and refuse to put everything in Don and his wife's name to keep the state from seizing their assets. Getting old and mean, they refuse to give Don and wife an advance on their inheritance, or give them a loan with 0% interest.
From the ages of both Don and wife neither Mother is even 80 years old yet and may be healthy as a horse, perhaps another 10+ years of life ahead of them.
If indeed late stage of Old Timers for them both, no way can they live alone nor will a once a week visit from Don and wife help them in any way.
I smell money here, there may be family internal problems with siblings that are more favored and wants the biggest slice of the pie.