They are not said to be husband and wife, who merely sit together. They alone are called husband and wife, who have one light in two bodies.
ਧਨ ਪਿਰੁ ਏਹਿ ਨ ਆਖੀਅਨਿ ਬਹਨਿ ਇਕਠੇ ਹੋਇ ॥ ਏਕ ਜੋਤਿ ਦੁਇ ਮੂਰਤੀ ਧਨ ਪਿਰੁ ਕਹੀਐ ਸੋਇ ॥੩॥
SGGS Ang 788
The same idea in other traditions
Fathers, provoke not your children to anger, lest they be discouraged.
Giving and righteous conduct, kindness to relatives, blameless deeds: this is the highest blessing.
Be ye not parted; dwell ye here reach the full time of human life. With sons and grandsons sport and play, rejoicing in your own abode.
The Prophet said: "He who deserts his wife and children is like a runaway slave; till he returns to them none of his fasts or prayers will be accepted by God." …
And Ruth said: ‘Entreat me not to leave thee, and to return from following after thee; for whither thou goest, I will go; and where thou lodgest, I will lodge; thy people shall be my people, and thy God my God; …
And among His Signs is this, that He created for you mates from among yourselves, that ye may dwell in tranquillity with them, and He has put love and mercy between your (hearts): verily in that are Signs for those who reflect.
The Master said, "In serving his parents, a son may remonstrate with them, but gently; when he sees that they do not incline to follow his advice, he shows an increased degree of reverence, but does not abandon his purpose; and should they punish him, he does not allow himself to murmur."
When the Great Tao (Way or Method) ceased to be observed, benevolence and righteousness came into vogue. (Then) appeared wisdom and shrewdness, and there ensued great hypocrisy. When harmony no longer prevailed throughout the six kinships, filial sons found their manifestation; when the states and clans fell into disorder, loyal ministers appeared.