What rhesus should be at substitute mother, if at the biological father and...

[Marina]

What rhesus should be at substitute mother, if at the biological father and mother a rhesus negative, at the father a rhesus negative, and at biological mother a rhesus positive? Whether the birth of the child with defects if biological parents already had a first abortion is probable?

[Rabaev S.G.]

We advise a concrete situation or hypothetical?

[Marina]

Concrete. It is a question of family of my sister. They speak, that at them with the husband rhesuses negative, but we with the sister mother thinks, that they confuse something to the husband, and at my sister, probably, a rhesus positive as at me with mother rhesuses positive, and mother fed with its or her milk. Now my sister searches for substitute mother with a negative rhesus. Please, answer all my questions, differently my sister can choose not that substitute mother.