Keeping inmind that on the 1920 census Joseph Preston 59 bn CA is a 'carder' in a Woolen Mill, I think I found him on the 1880 census. It is a very interesting/confusing household but maybe it will make sense to you. You can check out the extraction listing on Familysearch.org the LDS site for free.
1880 PA, montgomery Co, Bridge Port twp, pg 287D, h/h 183
Preston, Edward 55 bn England occ 'Carder'
Sophia 57 or 51 wife bn Delaware
Walter W. 19 son bn CA
Wilson, Chas. W. 18 son Delaware
Preston, Jos. A. 17 son bn CA occ Woolen Mill
I am thinking that Chas. W. Wilson must be a son of Sophia's from a previous marriage?? The other two Preston sons were born in California. Also the father of Chas W. Wilson is listed as born in Ireland. Based on Walter's age of 19, Edward Preston must have come to US sometime before 1860. If you think this is him, I will try to find them on the CA 1870 census.
The wife of Joseph Preston, bn CA, must have died before 1910.
On the 1910 PA Miracode index Joseph Preston is in one h/h as 'father in law' and older children are in another as follows:
1910, Miracode index, Delaware Co, ED129, #48 (not sure what this means)
H/H of Cain, John P. 69 bn MD
Catherine 56 PA
Preston, Agnes 23 PA Boarder (md Bolduc)
Preston, Hannah 19 PA Boarder (md Vance of 1920)
Preston, Walter 17 PA Boarder
1910, Miracode index, Phil, Phil,
h/h of Malone, Bart 56 bn IR (there's that IR again)
Mary 54 IR
Preston, Joseph 51 CA 'father in law'
Preston, Kate 13 PA 'sister in law'
This relationship makes no sense to me. Dont see how he could be the 'father in law' to someone in their 50's. Maybe it will to you. But the Ireland birth place must have some connection to the 1880 Wilson son whose father was listed as bn in IR. but is listed as son of Joseph Preston. Kate Preston must be another child of Joseph Preston and maybe to young to board out as the others did.
This might be your Albert Bolduc but the age/place of birth is off, it was known to happen often on these censuses. He would have been in the same county & twp as Agnes Preston. Plus the person doing the extraction may have read it wrong. Need to check the census film for yourself.
1910 Miracode index, PA, Delaware Co, Chester twp
Bolduc, Edward 56 bn CANADA
Sarah H. 56 PA
Albert H. 31 PA
1920, PA, Delaware Co, Cliffton Hights twp, ED 153, pg 3B
Vance, Moses A. 26 bn PA
Hannah M. 28 PA
William M. 2 2/12 PA
Preston, Joseph 59 wd bn CA, f bn England
Occ, 'Carder', Woolen Mill.
Did you notice on the the 1930 census Albert Bolduc is listed as born in French Canada?
Just a few tid bits to add to your notes. Although I descend from the Preston line, mine is not from England. But I know how hard it is to track them down and hope this helps some.