Recently observed

In an area where parking is difficult, 20 houses where there is only parking on the side of the road. Most people use their garage for their stuff as they do not have a shed, so the car cannot go in there. So what do you do. Park on the road side. But as its tight people have to make sure they park well so everybody can park their car or cars.
Some families have 2 cars, others 3. Now what struck me was that 1 particular is most of the time in a particular spot. Its at the corner, so not a bad spot at all. We noticed that the older 60 year old grandmother who is usually driving it, cannot park very well and probably needs to park at that corner. She has trouble driving it anyway. Oddly enough its not even her car, at it is the car of her son-in-law. But never mind that.
So, what started happening since a few months. When this particular car is used, one of the smaller cars of the family gets pulled down, blocks the road. The van gets taken away, put in the middle of the road, the small car gets put on the spot of the van and when the van comes back, the smaller car gets put back where it came from in the opposite ritual.
This makes me wonder what goes on in their heads. There are no allocated spots, there are more people with vans. It intrigues me to see this happen, it doesn't bother me, as I park more up the road anyway, but where does behaviour like that come from. There are no allocated spots, so what makes them think they own that spot?
Another interesting one is that, as there is already a shortage of parking the grandmother has stated for as long as we live here that lodgers etc. have to park down the road, not that many of them really care. One of the women next to her very much agreed, as there is no room anyway, according to the comments.
Now that woman has a boyfriend and they make an effort of making sure his car is parked right in front of hers. She will block 2 spots and then drive her car backwards when he comes if she feels the need to. This soooo surprises me, as that can mean that other people have to park down the road, people who actually live up here.
I keep wondering where behaviour like that comes from. On one end saying 1 thing, but pretty much behaving the opposite when that all of a sudden fits better.