When my parents moved into the CCRC, they got a two bedroom unit. My dad wanted his own office space so they got the studio unit next door to their two bedroom unit. They paid to put a door inside his bedroom to have easy access. Their contract is based on single occupancy for both units. Now that dad has passed away, their monthly invoice shows his name on the studio unit and she is paying full price (life contract A) for both units. Can they still have his name on the bill with him being gone for 2 months now? They won't let us drop the studio and pay to close the door to just go back to a 2 bedroom unit.
Now, whether the contract stipulates that the terms continue as long as one of the two signers is alive, that's another thing. You need to read the contract a couple of times until you really understand the terms. If you don't, then you need to consult an attorney.
You really need to have an attorney familiar with CCRC contracts and any ancillary documents review them to determine what options might be available.
One of the reasons I decided sometime ago after reading a bit about them was that the contractual requirements were so stringent and binding. And that unfortunately seems to be true.
You raise the issue of "single occupancy"; how is that defined in the contract? One person? One couple? Your question may turn on that definition, but that's only a speculation (again, never having read a contract for CCRCs).
It's also not clear to me why your father's name would now be shown on the invoice since he's obviously no longer using it. When your parents got the studio unit, did they purchase it jointly, i.e., with both their names on the title?
Can you sell that unit?
I suspect someone is taking a really hard line, which also raises the issue of your rights to challenge decisions. Again, this is why I think an attorney needs to be involved, and it should be someone familiar with CCRC contracts. An attorney can exert more force than a widow.
I wish you luck, and hope that when you do have an answer you'll share it. This might be a warning for others to look out for what seems to me to be a hard line approach, but certainly not reflecting concerns for aged who might want to participate in a CCRC.