If you are married or serious in this relationship the only one's who should come before your partner is your children...No brainer!
My brother's wife first, then my brother, then my parents, then my wife. But I would double check the fridge at least once before I resorted to cannibalism.
If you had children, they'll be first. Then your partner next, and your siblings and parents could come close after that, sometimes as equal as the partner.
Tricky, My partner is my family also when you have family you and your partner put children first. and there are times when your partner knows they are first but your parents or grown children need you and your partner says go.
In a good relationship, there is equal time for both!
my partner, definitely.
If you're married, your spouse comes first I'd say. If you're not married but dating well that's different.