Loving your partner should be considered more than loving your parents and siblings.
I believe it is so.
I find it a little incredible if one love his/her partner without first learning to love one's parents and siblings. I doubt the person will be able to love his/her partner well enough. Without being able to give your care and concern to your parents and siblings how can one love his/her partner wholeheartedly.
A simple analogy. If a child is not able to pass primary one, how can he/she go on to primary two. Its the same as loving one's partner. Without first loving one's parents and siblings, how then can one be able to love his/her partner?
Just like there are many different standards in primary schools. There are many different benchmark to this "love" because each individual is different. But moral values and personal feelings are the universal rules to loving those around you.