"My paternal grandfather likes fish and lemon."
Translation:Farfar liker fisk og sitron.
So you can only use farfar for your own grandfather? Why is there no min here?
The first person possessive is optional/implied. All other possessives are mandatory.
Is the first person possessive alway optional, or is that only when referring to family members--like mother, father, grandmother, grandfather, sister, brother, daughter, son, etc.?
It's optional when referring to certain family members (it's most common with relatives you're only expected to have one of), and when referring to one's own body parts.
Other exceptions can be made, but it does require that it's obvious to the listener/reader that you're referring to your own X. As a non-native, it's safer to always use the possessive outside of the cases mentioned in my first paragraph.
I'm wondering about the same. In other words: How can I say "[A] grandfather (likes something)" without him being my own grandpa?
Then you'd add an indefinite article "En farfar...", just like you would in English.
So, would "farfar" only work to describe the paternal grandfaher? In the case of a maternal grandfather, would one say "morfar"?
You could also say "Farfaren min er glad i fisk med sitron", "med" is used more than in english when we say "And" for example we naturally say "Strawberries and cream" but in Norwegian it's more normal to say "Jordbær med fløte".
Why is incorrect to use " faderlig beste far " because the sentence says " my paternal grandfather", no just grandfather
Because there's a word for that in Norwegian: "farfar"
Your "farfar" can only ever be your paternal grandfather, while your "morfar" is your maternal grandfather. The neutral word is "bestefar", but it looks quite silly to talk about en "faderlig bestefar" when there is an actual word for that.
Your paternal grandfather is your father's father, and your maternal grandfather is your mother's father.
The adjectives themselves come from the latin pater (father) and mater (mother), respectively, and point to something related to (being) a mother/father. For instance, we can talk of maternal instincts or a paternal figure.