Hi! What does it mean by "take the street by right of possession"?
(Here "he" is a very greedy and selfish man.)
He blustered out of the house and the boy and his father watched him take the street by right of possession.
He "took" it and now he "holds" it, and that adds up to "now he (figuratively) OWNS it."
Here is a little on the actual meaning of the phrase that is used figuratively in your passage:
(from Wiki)The right of possession means that someone currently holds something in hand and this person may be its temporary keeper or long-term owner.This term is most commonly used in regards to property and is a land-backed asset.This legal tradition holds that whoever occupies property and uses it for its social function has the right to possess it.