Do two people have to be husband and wife or children to immigrate to the United States? Whether my friend and I can immigrate together is not related by blood.

According to American immigration law, it is like this, that is, people who are not related by blood and are not husband and wife cannot immigrate and cannot take refuge as relatives.

All in the same household registration book. . Supposedly related by blood, so it's in the household registration book. Same last name?

If the embassy allows notarization or identification of kinship, can it be obtained?

If the above requirements are met, relatives can emigrate and take refuge.