There is alot of signs to see if two people have some kind of bond with each other. The easiest one to spot is the distance between the bodies of two people. When they sit, walk and / or stand close to each other, there is a big chance they have some kind of relation. They enter the personal space, which we know is mostly for close relations like intimates, children and family.
But it can be misleading aswell. We see other people often in crowded places, so and close proximity can be misleading in situations like this. Of when a young person is helping an old woman across the street, what can you tell about them? The change that they are, lets say lovers, is really small, but still they move close to one another. Or maybe they are just family. And there is two men who are walking close on the side of the street can be old friends or just one guy explaining the other guy (a complete stranger) the way to the nearest metro station. Read more
We all carry it with us, everywhere we go. A portable territory called a Personal Space. It is the region surrounding a person which they regard as psychologically theirs. For every person this range is different. open, social people let people come physically closer then a, from nature more scary person. Most people value their personal space and feel discomfort, anger, or anxiety when their personal space is encroached. Those of us who have to spend a great deal of time in crowded conditions become gradually better able to adjust, but no one can ever become completely immune to invasions of the Personal Space.