If you were broadly faced with two options - one person is very ill, requires a down stairs bathroom etc, unlikely to see much improvement in their condition, it is life limiting. Both people currently employed FT, ergo not entitled to any welfare/benefit assistance, unless the ill person make rapid steps toward recovery, it is likely they will be unemployed, and longevity probably isnt going to happen either.
There is still 25 % of the mortgage outstanding. Ill person is about to turn 55, so pension access is possible, but commuting 25% of the pension pot will not pay off the outstanding 25% of the mortgage.
Would you
(a) shake and groove to keep the house that you have due to sense of community, friends, ease of commute for the other person, school and so forth, it is an area you know well, grew up in, your GP and hospital are on hand.
or
(b) Downsize, which means moving away a little, either into a not-so-nice area or moving quite a way out of town, which means the ill person may become isolated, getting to school/work/hospital appts becomes a bit of pain, but you will be mortgage fee and able to financially relax a little.
WWYD?