As more far relative ties, thus are stronger for generation.

 And on  a which level for relations ties are ability family creating for a goal a healthy children's birth.Am heard, that  in a few countries are married of family relatives, does it true possible are relatives between sisters, brothers, grandchildren.

By the laws a genetically connected genomes for close relatives creating conditions for displaying in generations are defects in genetical apparatus by mum and dad Answer Doctor Treskunov. And in a new life origin, a future baby getting from dad are chromosomes quantities as male sexual Y  and X chromosome, from a mother s ovum . A  sex for baby defines a dad, and in transferring  chromosome a boy was born, in X a girl. And with a quantity for  gene material, a baby getting a genetically and lots of diseases, which compensates a healthy gene having in a second chromosome.And if in a baby are two filled defected genes, that happening i the relation marries, relations, thus disease is inevitable. In incest is a rising risk for inborn heart defect, stenosis lung  arteries, mucoviscidosis, hear bad, cystinosis, albinism.

And therefore these marries are prohibited between close relatives as relatives by a straight ascending and descending lines are parents and children's, grandmothers, grandfathers and grandchildren, full- blooded   and half-blooded  are having common father or mum. Brother and sisters. , as a more far parents in cognations ,thus a healthier generation will be. And in other countries  are welcome for relocations to theirs are migrants for dilute a having in a citizen a hemafund. And for you, that to marry are young peoples where is having by a genetically in led a genealogical tree a grandmother and great-grandmother, are close sisters, by a law am not to see contradictions.