Pidyon haBen for a child of a Jewish mother and a non-Jewish father

Hi,

A son born to a Jewish mother and a non-Jewish father must have pidyon haben (assuming the general criteria for pidyon haben are met). If there is concern that the child might not do it himself upon reaching adulthood, the mother's father (or others) may do it on his behalf.

The money used for the pidyon should be assigned to the child for the sake of redemption, and the blessing recited should be changed to "al pidyon habechor".

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:195)

Have a great day,
Mordechai