The DAA 1966 and https:finnholbek.dk reference shows that Eiler is the father.
Margrethe was born about 1568. She passed away about 1654.
Thiset, Hiort-Lorenzen, Bobé, Teisen.. Danmarks Adels Aarbog. Dansk Adelsforening, DAA 1966:II:3, 2 a.
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E > Eilersdatter | G > Grubbe > Margrethe Eilertsdatter (Eilersdatter) Grubbe