Bismillah-Ir-Rahman-Ir-Raheem 
AsalamuAlaykum Warahmatullahi Wabarakatuh,
Question:
One of my relatives has come to me for the purpose of marriage but I heard to marry from non-relatives is preferred for the sake of the future of the children and other reasons. What is your opinion on this matter?
Answer:
The principle has been stated by a number of scholars. It points to the fact that genetics and heredity has an effect. There is no doubt that genetics has an effect on the physical and psychological make-up of a person.
This is shown in the hadith where a man came to the Messenger of Allah (sallallaahu ‘alaihi-wasallam) and said,''My wife has given birth to a black child.” ( He was opposing that child as all of his ascendants were of light skin.) .
The Messenger of Allah (sallallaahu ‘alaihi-wasallam) told him, ''Do you own camels?” He said, '' Yes.” The Prophet (sallallaahu ‘alaihi-wasallam) said, '' What colour are they? ” He said, ''Red.” The Prophet (sallallaahu ‘alaihi-wasallam) asked him, ''Is there a dusky one among them ? ” He said, ''Yes.” The Prophet (sallallaahu ‘alaihi-wasallam) then said , ''How has that come about ? ” The man replied , ''It is perhaps due to the strain to which it has reverted .” So the Prophet (sallallaahu ‘alaihi-wasallam) told him , ''Perhaps that son of yours is due to the strain to which it is reverted. ” [1]
This is evidence that genetics does have an effect and there is no doubt about it. However, the Prophet (sallallaahu ‘alaihi-wasallam) also said,
''A women is married for [any of] four reasons: for her wealth, for her lineage, for her beauty or for her religion. So try to marry one who is religious, may your hands be smeared with dust. ” [2]
Therefore, the most important matter in proposing to a women is her piety. The more religious she is and the more beautiful she is then the better she is, regardless if she be a close relative or distant [non-] relative.
The religious women will protect the man’s wealth, children, and house. Beauty fulfils his needs and lowers his gaze and he will not look to others. And Allah knows best.
________________________
[1] Recorded by al-Bukhari and Muslim.
[2] Recorded by al-Bukhari and Muslim.
Shaykh Muhammad bin Saalih al-`Uthaymeen
Source: Islamic Fatawa Regarding Women - Darussalam Pg.187-188.
AsalamuAlaykum Warahmatullahi Wabarakatuh,
Question:
One of my relatives has come to me for the purpose of marriage but I heard to marry from non-relatives is preferred for the sake of the future of the children and other reasons. What is your opinion on this matter?
Answer:
The principle has been stated by a number of scholars. It points to the fact that genetics and heredity has an effect. There is no doubt that genetics has an effect on the physical and psychological make-up of a person.
This is shown in the hadith where a man came to the Messenger of Allah (sallallaahu ‘alaihi-wasallam) and said,''My wife has given birth to a black child.” ( He was opposing that child as all of his ascendants were of light skin.) .
The Messenger of Allah (sallallaahu ‘alaihi-wasallam) told him, ''Do you own camels?” He said, '' Yes.” The Prophet (sallallaahu ‘alaihi-wasallam) said, '' What colour are they? ” He said, ''Red.” The Prophet (sallallaahu ‘alaihi-wasallam) asked him, ''Is there a dusky one among them ? ” He said, ''Yes.” The Prophet (sallallaahu ‘alaihi-wasallam) then said , ''How has that come about ? ” The man replied , ''It is perhaps due to the strain to which it has reverted .” So the Prophet (sallallaahu ‘alaihi-wasallam) told him , ''Perhaps that son of yours is due to the strain to which it is reverted. ” [1]
This is evidence that genetics does have an effect and there is no doubt about it. However, the Prophet (sallallaahu ‘alaihi-wasallam) also said,
''A women is married for [any of] four reasons: for her wealth, for her lineage, for her beauty or for her religion. So try to marry one who is religious, may your hands be smeared with dust. ” [2]
Therefore, the most important matter in proposing to a women is her piety. The more religious she is and the more beautiful she is then the better she is, regardless if she be a close relative or distant [non-] relative.
The religious women will protect the man’s wealth, children, and house. Beauty fulfils his needs and lowers his gaze and he will not look to others. And Allah knows best.
________________________
[1] Recorded by al-Bukhari and Muslim.
[2] Recorded by al-Bukhari and Muslim.
Shaykh Muhammad bin Saalih al-`Uthaymeen
Source: Islamic Fatawa Regarding Women - Darussalam Pg.187-188.
given the higher rate of genetic mutations associated with offspring of an inner family marriage, aside from the fact there are more women in this duniyah than men i dont see there to be problem of going about the halal process of finding a wife (wives) inshaAllah, waAllahu Alaam this is my opinion may Allah(SWT) have mercy on us all aameen.