That's not true for all Portuguese speakers. Most brazilian northeasterners don't use it as you described, as it's unnecessary.
Edit: The way I would say the sentences above:
"Pra meu pai"
"Sou filho de meu pai"
That's not true for all Portuguese speakers. Most brazilian northeasterners don't use it as you described, as it's unnecessary.
Edit: The way I would say the sentences above:
"Pra meu pai"
"Sou filho de meu pai"