Non-emotional logic:

Brother and Sister
Father
Mother
Wife

They're all arranged in ascending order after sorting.

On emotional logic:
Mother
Father
Wife
Brother and Sister

Its the mother we all gel with at first, followed by the father. Brothers and sisters is a favourite at 3.. but what about those who don't have siblings? Also, after marriage, priorities will be more for a husband towards his wife (assuming its a healthy relationship)