Sorry to hear the bad news. I know that I was quite upset when Mr Spudqueens Gran died, though probably not as upset as him and his family. I do think you've done the right thing in going to work, you're going to need time off for the funeral anyway. If I were you I'd go home with the intention of cooking a meal for everyone in case they are still out, busy, haven't thought of it etc. Practical help (including asking if they need any help shopping for clothes for the funeral) is probably very welcome at the moment, and they will appreciate you looking after their dogs aswell.