This is my first time really trying to manage more than one family in TS4 (I usually play quasi-legacy style where I follow one 'heir' and send the off into the world to do their own thing, but this time I wanted to try my hand at multiple families). I had my sim date and move in with Alexander Goth and the other Goths, but was way too attached to her family that I had them move in with hers a sim day or two later. By the time I put them back in, the beloved family pet had died, and I can't find his urn anywhere.
I have no idea where he died or how he died.