Be aware that
DVC room occupancy is hot topic here on the DIS. Currently, member services is booking 5 into a one bedroom unit, however, no one know how long that particular policy will last, most speculate it will stay at 5. As you've noticed, everything in writing says "4", so they
can change it if they see a problem.
There are no rollaway beds or cats available at DVC resorts, so an inflatable mattress or sleeping bag would be a good option for that 5th person...unless your kids are young enough and small enough to all sleep together on the sofa sleeper. Also DVC will not provide extra towels and bed linens for the 5th person. Towel packs (4 bath towels, 4 hand towels, 4 washcloths) are available for an additional charge of $6.
I'll leave the thread open for now, because you are discussing other things, not just occupancy, but our general policy is to close all threads that discuss occupancy and refer them to this thread
DVC Occupancy thread If the discussion becomes heated, this thread will be closed.