Well done.I just thought I'd bring this to a conclusion.
I updated my CV following the replies on here and chose to add "Full-Time Carer" as my latest role with literally a few words explaining why I left my last position.
I had three interviews where it was barely mentioned until today where the interviewer commended my honesty and decision to put my partner first. Four hours later I got a call offering me the role.
Honesty is usually best with these things and you have found a company with seemingly good values to boot.