There is no relationship, since genealogy is the study of blood relationships, but you could call them cousins-in-law.
the relationship of people based on marriage or blood
You would call this "dating" or simply "a relationship." If you get married, you would call this a "marriage."
A common law marriage
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Call the police or call a hotline, There are people in this world who are here to help.
In China, a marriage may be nullified for the following reasons: bigamy, spouse with a blood relationship, spouse with a disease imported to the marriage and spouse below the lawful age of marriage.
As i know that two type of relationship Blood relationship and marriage relationship. Correlative relationship mean by your nearest relative like brother in law, sister in law, uncle, unty etc...
The period of time closely following a marriage is often referred to as the "Honeymoon" period. It is recognized as a time of little conflict in a relationship.
A stepson is the son of your spouse by another previous marriage partner or other relationship. This child is not related to you by blood.
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Your cousin's wife is considered your cousin-in-law. This means that she is related to you through marriage, but not by blood.