to say: "im going to my friend's house"

is it correct to say " ev arkadaşıma gidiyorum" ???

how do you talk about other people's posessions in turkish?
e.g "im going to Her/his house"
"his/her car is blue"
"my mum's hair is black"

etc etc!

I'm going to my friend's house-
Arkadaşımın evine gidiyorum

I'm going to her/his house-
Onun evine gidiyorum

His/her car is blue-
Onun arabası mavi

My mum's hair is black-
Annemin saçı siyah

merhaba tercüme edermisiniz lütfen.." i m here just for you .. y dont u believe me ... nonsence"