My dad will be visiting my house throughout the time that I am away, but primarily to make sure things are fine and to take care of my garden (mostly just harvesting whatever comes on while I am away, and watering as necessary). I could ask him to look after the tank and dose it with ammonia for me when he comes, but I don't want to add another thing to his plate. I'm sure he would do it, were I to ask, but I hate asking him to care for my garden while I am away, let alone adding more to the list. Maybe that's what parents are there for. Maybe if I tell him that the tank is my son's, that would get it extra special care while I am away! He's a nut for his grandkids.
I guess it's worth a conversation with my dad to gauge his interest. Originally I had planned on my brother taking the 10 gallon to his house and keeping the filters seeded that way, but his work schedule is getting worse, not better. (Corrections officer, who works bizarre hours.)
I guess I have a bunch to think about between now and then... fortunately I still have a few weeks left to sort it all out.