Answered by Mufti Yusuf Mullan
Wa alaikum salaam,
Yes. They can marry. (In fact, man A can marry woman Bís daughter himself!) [Haskafi, al-Durr al-Mukhtar 214/3]
Even in a situation of actual blood lineage the marriage between the son of man A and daughter of woman B is clearly permissible. At most they are cousins through nursing and marriage between cousins is perfectly fine.
And Allah knows best.
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