Bharat sons were Taksha and Pulkal .Taksha set up Takshashila and become the king of that land.Pulkal setup Pulkalavati in Gandhar and reigened as king there
Shatrughan has two sons Bhupakete and Subahu.Bhupaketu was given Vidisha and Subahu was given Mathura to rule as kings
Laxman sons were called Angad and Chitraketu . Angad was assigned Karupath and Chitraketu Mallahadesh Chandraga puri
in the end Rama gave his son Luv Kush there share of kingdom .Luv was given Lavpur(present day lahore) and the elder Kush was made king of Ayodhya
source-----valmiki ramayana