I no longer recall the mystery specifically, though working with the family may bring it back to mind. this is the family as I have it;
Catherine TILL 
b. unknown
d. unknown
Sex: F 
Marriage 1 Hezekiah Richards CROSS b: 1 Nov 1788 in St. Nicholas,Colchester,Essex,England
Married: 29 Dec 1811 in Saint Nicholas,Colchester,Essex,England
Children
 Alfred Till CROSS b: 27 Dec 1812 in Saint James,Colchester,Essex,England
 Mary Ann CROSS b: 13 Nov 1814 in Saint Botolph,Colchester,Essex,England
 Rebecca CROSS b: 16 Sep 1818 c: 11 Dec 1834 in Saint Nicholas,Colchester,Essex,England
 Edward CROSS b: 4 Dec 1829 c: 2 Nov 1834 in Saint Nicholas,Colchester,Essex,England
 Thomas CROSS c: 16 Nov 1834 in St. Mary Virgin,Colchester,Essex,England
Alfred m. Lavinia King, apparently without prodigy, the rest of the children I've never found marriages for.
Hezekiah had a Quaker birthright but Thomas is known to have been baptised in the CofE.
they could have had 2 Mary Ann's, but there's some question about that.
Newton is born at the right time to be Catherine's brother, but whether he is I've no idea.