"Morfar er faren til min mor."
Translation:Grandfather is the father of my mother.
Ah. Is this the same as 'en' can be used as for masculine or feminine gender rule. I'm asking because I haven't noticed that in the adjectives. Although it's very likely I just missed it.
Exactly that, though you must be consistent. For example, you can say "moren min" or "mora mi", but not "moren mi".