Depends on where you end up landing I suppose since each brother has their own territory to start from. Heart of the city you will meet the second brother who if you wave an olive branch so to speak will let you land. Land in the outskirts with forts where the first brother will be and if you don't say that your helping him he will do his best to shoot you down. Land on the moon and the third brother will let you land but will make sure to steal anything of value you have