not seeing the child

Any mummy has sole custody and care and control of the child. I do have. Wat i want to ask is, my ex husb hasnt seen the child for 3yrs. Now my child is 4yrs. Every month he gives maintenance. On and off he will ask me sent pic of my son. Do you sent pic if ur ex husb ask? Only my ex mil n ex sil every month once or two month once they will meet up with me n my son for lunch. My ex husb doesnt bother. Till now my son doesnt know who is the father.