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I am researching the Sinden lineage. 
I have traced my ancestors to those that traveled from London to New York (Castle Garden on 7.23.1834 via the Thomas Wallace ship).

James Sinden, age recorded 34 - b. about 1800
wife: Harriet (possibily POLLARD), age recorded 32, b. about 1802
(if Pollard, married: 6.19.1819 in Catsfield, Sussex, England)

Children:

Naomi, age 9, b. about 1825
James William, age 7, b. 4.16.1828 (my line) born in Catsfield
Alice, age 5, b. abt 1829
William Wallace, age 3, b. abt 1831
Harry, age 2, b. abt 1832

Can anyone help me with:

I would like to confirm births for all, if possible. 
I received an email that Harriet Maria Pollard was buried in Catsfield per the Catsfield Parish register, dated 8.9.1836 at 37 yrs of age.
I have record that they arrived in NY, yet I  cannot find any records from that point. 
I wonder if they returned to England... if the children were with them... and James & Harriet's parents names.
I know that James William married in 1850, MO. USA.  I have not found records of the family returning to NY.

Thank you again!  I appreciate any and all guidance!