Welcome Aboard! Sorry to hear about your Dad.
Water heater, as Dnbould stated an Atwood water heater does not have an anode rod. You can open the outside cover, and you will find the low point drain. The OEM drain plug is a white nylon plug, in the lower left corner. Your father could have changed it. Might be metal, or even replaced it with a small hose. The bypass valves are located behind the water heater. There is a hidden compartment. So locate the water heater on the outside, then go inside to the corresponding spot and start looking. Most likely you will need a #2 square drive (#2 Robinson) screw driver to access the location. Many people do remove the screw(s) and leave them out. Might access it from above or behind. Once in a while, Jayco does not put it right behind, if there is a bunk or other hard to access location access.
Water Filter, I have only seen Jayco install one water filter inside a camper. It seems like all MH water filters are buried. I would check the pipe fittings, you might have a Tee after the filter, and it goes to both the bathroom and kitchen sink. A good way to confirm is to contact Jayco with your vin # and ask for the piping schematic.
Good Luck
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