Neighbour parking area should be limited

I live in a congested locality. so there are houses very close to each other. streets are narrow and only 2 cars at a time can cross each other. my neighbors have two houses opposite to each other. they park their 2 sedan cars at wall area of their houses and keep their gates vacant keeping the area bounded by plants on the road. whenever there is a space people park their scooties and bikes near their plants or at front or bike of their cars because thats the only area left for parking 2 wheeler rest everyone has floor system. the mother and the daughter make 2 wheeler fall. talk people rudely and abuse them. is there a way out? is parking at front houses is owners parking? doesn't it belong only to Delhi govt as whole of the area for the houses is covered. if it belongs to Delhi govt then anyone can park there? why they insult other people.? is keeping plants at boundaries legal? if the parking area belongs only to owners then how much area they can cover? THEY WANT TO PARK LIKE THE WHOLE STREET BELONGS TO THEM. they keep their gates clean but parking at others wall is f9 to them? if they define their area then their cars should not enter others boundaries. WHAT CAN BE DONE TO THiS MATTER?