Losing a parent is a shock, especially when it happens in an unexpected manner like this, but it's something everyone faces and most people don't take extended leaves from work as a result.
Also, if you want to get into boating, don't let an animal onto your boat. This accident happened because the family dog stepped in between mom and dad switching passenger/driver positions.
If you have the money and the ability, and the pain is hard enough, why would it be unreasonable to take time off? I haven't lost a parent yet, but I would probably want more than a weekend to grieve.