Isak Einstein and Miriam Einstein were cousins through the Leopold/Jehuda Einstein–Esther Oettinger family.

Evidence

The two reconstructed parental lines converge on Leopold/Jehuda and Esther.

People

Isak Einstein, Miriam Einstein, Leopold/Jehuda Einstein, Esther Oettinger

Places

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Family lines

Fellheim–Laupheim Einstein

Supporting sources

Isak Einstein gravestone edition and family notes, Miriam Einstein gravestone edition and family notes, Daniel Leopold Einstein scholarly register reconstruction, Lazarus/Elieser Einstein gravestone edition and family notes

Contrary sources

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What remains uncertain

Depends partly on scholarly register reconstruction not yet primary-proofed in the repository.