Formal:
* എന്റെ മകൻ (ente makan) - This is the most common and formal way to say "my son."
* എന്റെ പുത്രൻ (ente putran) - This is a more literary and formal way to say "my son."
Informal:
* എന്റെ മോൻ (ente mon) - This is a more informal and affectionate way to say "my son," usually used by parents.
* എന്റെ കുട്ടി (ente kutty) - This is a very affectionate term meaning "my child," often used for a young son.
The best way to choose the right phrase depends on the context and the relationship between the speaker and the listener.