What probability of a birth of sick children at marriage or spoilage to honey rodsvennikmi third...

[Sergey]

What probability of a birth of sick children at marriage or spoilage to honey rodsvennikmi the third pokalenija, if they also relatives of the fourth pokalenija on other line? How it to correspond with a case if related or congenerous attitudes or relations are not present? Advise something to esteem in a network or in books. Where it is possible to receive consultation? Whether it is necessary to carry out genetic researches to partners? Whether it is possible to carry out genetic research of the child till a birth and how much or as far as results of this research will be authentic?

[The old man]

More shortly, mine the grandson to marry my great-granddaughter, parent lines at them are not crossed (are crossed only in me). What probability of a birth of sick children? Help or assist.