We are lucky in this respect. The bride and I are both only children. Her parents will live where they are until they die. they could do ok as depletion runs its course but even if they don't, there is no way they would head up here.
That only leaves my parents. Both are relatively young (they were 19 when I was born) and are very useful. Luckily they stayed friends after the divorce. Their grandchildren are their focus so I would expect them to head are way as they are able. I do not need to tell them to work hard.
That only leaves the unexpected friend or cousin... and that would be really unexpected. I would sit them down for a little talk about expectations. I would then set them up in their own abode (whatever that might be) or house them with a knowledgable older couple who could use the extra labor in the garden. There are quite a few older couples in the area with large gardens.
Thats right. Be as friendly as possible but get them out of my hair as quickly as possible.
Other ideas for rules (some of which have been mentioned):
1. youngest eat first
2. I decide who does or does not have access to guns
3. When I request you do something, it is not really an option. I was just being polite.
4. There will be a division of labor. Do not complain about how someone did something unless you are willing to take on the job in addition to the jobs you already do.
5. the writer of the rules is exempted from rule number 4. I am the person who has been ruminating over this issue for years. You do it my way and for my reasons. If I will tell you why, it will be at the end of the day and I reserve the right to charge you 1/2 your potato.
6. If you do not like the food, do not eat it but do not complain about it. If you like the food be sure to tell the cook.
7. Behavior that instigates or fans conflict will not be tolerated. There will be time enough for back biting when we all live in our own houses and do not have to spend each day, every day, together.
8. If you do not like the rules, the door is right over there.
9. First time breaking of the rules results in being assigned the least desired chores (probably involving humanure). Additional infractions will result in increasing penalties. The highest being exile if actions put the survival or health of another member in unnecessary danger.
Ok, so I'm more serious about some more than others (I would not charge my mother 1/2 potato to tell her why I wanted something done a particular way... though I might charge an unexpected refugee for the same information), but you get the idea.