Excuse me for jumping in here, but I found the following which MAY be of interest.
1870 US Census
Philadelphia Ward 26, District 86
FARREL
Patrick, 55, labourer, b Ireland
(H)ellen, 42, b Ireland
William, 22, b PA
John, 11, b PA
Mary, 9, b PA
William, 4, b PA
Laura?, 2, b PA...wondered if this might be Lawrence
BUT, where is Annie
There is another FARREL family living immediately next door also from Ireland.
Willliam 45, Mary 40, James 13, Rose 11, Ann 9, Wm 4, John 6 mos.
The children were all born in PA
Long shot I know, considering the ages

Grub