A couple of husband and wife have lots of time and involve a lot of things in their lives.
They are free in expressing their feelings and togetherness.
Couples face many problems in their lives and they solve together.
You do not worry when a husband and wife fight, because they will make up again together tonight.
So they have their own strengths and weaknesses in togetherness.
Household problems and conflicts will be useful to strengthen the sense of love and affection between family members.
When sorrow comes, then you must be able to understand that suffering comes to strengthen household ties, not understood otherwise.