Greetings!
One thing that God didn't like is marrying from one's kinsmen or women and this is because it's been prohibited by God.
God has prohibited humans from marrying their family members and no wonder he said in his word that we must not see the nakedness or uncover the nakedness of our family of any sort.
Leviticus 18:6-19 None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the LORD.
The nakedness of thy father, or the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness.
The nakedness of thy father's wife shalt thou not uncover: it is thy father's nakedness.
The nakedness of thy sister, the daughter of thy father, or daughter of thy mother, whether she be born at home, or born abroad, even their nakedness thou shalt not uncover.
The nakedness of thy son's daughter, or of thy daughter's daughter, even their nakedness thou shalt not uncover: for theirs is thine own nakedness.
The nakedness of thy father's wife's daughter, begotten of thy father, she is thy sister, thou shalt not uncover her nakedness.
Thou shalt not uncover the nakedness of thy father's sister: she is thy father's near kinswoman.
Thou shalt not uncover the nakedness of thy mother's sister: for she is thy mother's near kinswoman.
Thou shalt not uncover the nakedness of thy father's brother, thou shalt not approach his wife: she is thine aunt.
Thou shalt not uncover the nakedness of thy daughter in law: she is thy son's wife; thou shalt not uncover her nakedness.
Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.
Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.
Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.
Also thou shalt not approach unto a woman to uncover her nakedness, as long as she is put apart for her uncleanness.
In the above scriptural verses, we were being told and informed by God, who and who not to marry nor see their nakedness and if we should closely, all those mentioned in the above scriptural verses are the family members.
Aside from this and according to Bro. Eli, it's not even good according to the scientific research to do such as babies being produced through such marriages are always with defects both physically and mentally and this has really helped us to buttress the stands of the bible on who and who not to get married to.
In conclusion, Bro. Eli has told us according to the scripture who and who not to marry and he even admonished us to wait for a neutral person and get married with.
Thanks for reading.
Our cultural principles does not allow us to marry our relatives
I think cultural wise, it is not good to marry your family relative. It is not good and it is a taboo