Can Cousin Marrying Cousin: Be Legal, Sin or Genetic problem.
Marriage among cousins was a custom in some parts of Hindu and Muslim countries but very much lower in the ratio in the Western countries.
Also, this custom was followed by some kings and emperor families to retain the throne and thereby kingdom.
Examples Cleopatra, the queen of Egypt, was married to her own younger brother.
It is also observed that even in Europe and United states cousin marriages have taken place among ordinary people. But the tradition has been discouraged severely since the recent past.
Even it is considered illegal or unethical based on personal feelings of unacceptability.
This discouragement was solely due to the view of some so-called idealistic people.
Even there is specific scientific evidence of genetic abnormality, diseases and lack of conception among the married cousin couple. This could also be another reason for the decrease in cousin marriages.
Why or why not
The primary aspect of humans which distinguishes them from animals is that lack of marriage and the sexual relation between children and parents and also between children of same parent or parents.
But still, cousin marriage was encouraged by the ancient thinkers with some intentions like.
1. To strengthen the blood relation linked relationships.
2. To hold or safeguard the property or kingdom of the members of the family lineage.
Marriage between noncousins has some advantages like better and healthy progeny. Broadening of related groups. A building of friendships etc.
There were cases wherein some kings gave their daughters in marriage to a mightier king (troublesome) with the intention to build friendship and safeguard their kingdoms.
How to rules for cousin marriage.
There are people who doubt if its right to go for cousin marriage in both negotiated and also love weddings. This is because of fear of improper progeny (by science) or illegal by rules of law or religious (unethical or Sin) or something else.
Improper progeny aspect (genetic): There are a good number of cases with troublesome conception or defective children due to cousin marriages. But the ration or chances of this improper progeny is smaller.
The cousin marriage if as a custom running from very long or many previous generations, then the chances of improper progeny is higher. But if there is no history of cousin marriage in at least past few generation, then it may not pose a severe problem.
Legal aspect: There are not many nations which made laws regarding cousin marriage or prohibition of cousin marriage so check for the rules if any in your nation.
SIn or ethical aspect: As regards to the human and animal differences philosophy, cousin should not be preferably a child of the same parent as per religious ethics.
But as a rule of cousin marriages, let's see how they were or even now practiced in certain religions
The law of Hindu community was to go for the wedding among cross cousins, i.e., a guy can marry his father's sister's daughter or his mother's brother's daughter.
But it is also said that among Muslims a guy could marry his father's brother's daughter.
Science points out to a likely problem in the outcome of the children. But the ancient Indians or intellectuals are not that ignorant in this aspect. Perhaps they have this tradition to retain or keep up the family relations of past intact.
Anyhow, I feel this system also helped them get a guy or girl in marriage, whom they had a bit of acquittance or the prior idea of their nature, character or culture, etc.