Grono Vychan 
He had a biological son named Madog of Penrhyn.
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Children
Madog of Penrhyn Ap Grono Vychan
Madog of Penrhyn was born in Penrhyn. Madog of Penrhyn is no longer alive.
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Grono Vychan Madog of Penrhyn Ap Grono Vychan