Johns father was Zachariah, yes he was a priest.
the priest is called a father
The priest of the Church of On is Father Thomas.
Father, Reverend father
Father
the priest was Father Fermin Lasuen
it is a rank, in the Catholic Hierarchy from Priest to Bishop etc, he could be called a Father Confessor or Reverend Father, or just Father
No, Patrick's father was a deacon but his grandfather was a priest.
The priest is generally greeted as 'Father' by the lay people.
He became a priest when he was 24 years old
Father
It is more usual to abbreviate Reverend, as Rev., rather than to abbreviate Father.