Another thing I’ve noticed:
2. Large families should always walk in straight lines that effectively block the entire pathway, so as to enjoy the conversation of those they love most. It is a sign of affection to put the elderly, or otherwise less-mobile, on the left side of your group, and to slow down the family’s pace to match grandma. And don’t mind her zig-zag walk – that’s what old people like to do, and they should be left to their own (de)vices. When others who try to pass from behind, or when those who approach from the front, are blocked, never mind their lack of access; after all, your family’s conversation (and grandma’s staggering) is of utmost importance.