thanks everybody for the replay.
So if i understand correct is not a problem to add the name of my gf in the blue tabien ban.
The condo is mine and i have a chanote in my name so she cannot do any bad things.
Only problem is at the moment the blue book is empty so in case i will add she .
She will be the first one, so she will be the house chief. And in case i want to remove she it will take a bit of time.
Anyway in case i add she in the blue book, i think is better for me to keep the original tabien ban in the safe and just give she a photocopy. Since the condo is mine , i think i have the right to keep the original blue tabien ban or not?
i am thinking to add them (gf and my child) becose is more easy in case they need to go to hospital, school ecc ecc