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According to Birth Certificates:
The father of Florence is Charles Ponaro (Seaman), her Christening Record and Marriage Certificate states Joseph Ponaro as her father.
The father of Herbert is Walter Ponaro (Seaman).
The father of Frederick is Walter William Ponaro (Seaman).
There are no records (in the UK) of a Charles or Walter Ponaro. There are no records of Joseph Ponaro after the marriage.