Just realized I OPPSed on this 1910 Miracode Index. There were two Bart Malones living next door to each other. Now the whole 'father in law' makes more sense.
1910 Miracode Index, PA, Phil, Phil, ED 878, Visit # 151
Malone, Bart 27 bn IR
Anna 19 PA
Joseph N/R PA (must be an infant)
Preston, Joseph 51 CA 'father in law'
Preston, Kate 13 PA 'sister in law'
Without the 1900 census it had to say but I bet Anna is another Joseph Preston daughter. That must be why he ends up in Phily for this census.
Also I left out a child on the 1880 PA census for
Preston, Edward 55 bn England
Sophia 57 Delaware
Walter W. 19 bn CA
Wilson, Chas W 18 bn Delaware (father bn in IR)
Preston, Jos. A 17 bn CA
Butler, Chas 7 bn PA (father bn in NY)
all of these boys are listed as 'sons'. On the Familysearch.org site the index has Chas as Buter but when I viewed the film it is Butler. The Jos. A Preston here must be Jos. R. Preston because on the 1870 census he is listed as Robert Preston.
1870 PA, Chester Co, Valley Twp, pg 47, H/H 168
Preston, Edward 45 bn England works in Woolen Mill
Sophia 48 Delaware
Walter 10 CA
Charles 9 Delaware
Robert 6 ditto (should be CA)
On this census all boys are listed as 'son' & have Preston surname unlike the 1880 above census.
1860, CA, Placer Co, Twp 7, pg 895 (second page to the end of this group) H/H 29
Preston, Edward 30 (but the 0 doesnt look like the others, might be a 6?) bn England Miner
Anna 22 bn England
This could be your Edward Preston, his sons would have been born between the 1860 & 1870 census.