Injunction

We demolished our old house and were building new, our left-sided immediate neighbor is lawyer and troubled us a lot because we had common walls between us, so when demolishing some of their walls damaged, which we said will repair and also they 3-4 windows on 1 and 2 floors, which we need to close when building ours. During this period the lawyer had some verbal altercation with my Jiju, so the lawyer took it personally and went to court to bring stay, but lockdown took place and it got hold there. KNowing about this we went to him for mutual settlement, to which he said he has filed case, but whenever u get notice, bring that to me, will go to court and make an agreement which u need to sign. We are 3 owners for this property. Today I received that notice. Its mentioned as Suit for declaration, permanent Injunction and suit valuation Rs 2000. Please tell me what does this mean?..In notice he mentioned of easement of light air, what does this mean? Other thing is now the lawyer is building windows in his existing house on the wall to his immediate left where he has just 1-2 feet of gap from his left-sided neighbours..so is this legal or valid for him to build such?