It means it is all the property that belongs to a married couple only.

Technically, any couple, regardless of their marital status are considered a spouse.

yes

Toby Bobes has written:

'Doing couple therapy' -- subject(s): Marital psychotherapy, Family psychotherapy

The right to ownership of marital property as allowed under the laws of the state where the couple last resided or were married; the legally retaining of parental rights until/unless a court rules otherwise and the right to obtain a divorce.