If you search for MANNS baptisms: parents : John & Mary

1820 - Joseph - at Dymock
1822 - Jeremiah - at Kempley
1824 - John - at Kempley
1826 - William - at Dymock
1829 - Sarah - at Kempley
1831 - Henry - at Kempley
1834 - Samuel - at Kempley
1837 - Mary Ann - at Kempley
1840 - Thomas - at Kempley

1841 Census, Kempley Green

MANNS
John - 50 - Ag Lab - born in County
Mary - 40 - born I (in end column usually means Ireland)
Sarah - 11
Samuel - 6
Mary Ann - 3

Joseph's marriage in the records - gives his father as John

Checked with the GRO Index - but can't see a record for a Mary Ann MANNS - 1837 or Thomas 1840 - which could give the mother's maiden name.

There are Goal records for a John & Jeremiah MANNS

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On the 1851 census, John gives his age as 64 c1787

Looking at family names it is possible John is the son of Jeremiah & Ann MANN - born Hartpury, 13 January 1788