I don't have pay access so don't know what's on the full record, just thought it would be worth checking out. It is on the "Pennsylvania Deaths and Burials" database. On the free access by search-spamming* I could see his dates were something like b. 1864 d. 1906 so thought he might be a good bet.
*search-spamming: when Ancestry or similar sites don't return full details, select "exact" or "range", put in a year and see if you still get that result back. Doing this you can narrow down quite a few details before you decide if it's worth paying for.
Part of the problem is that there were so many mining accidents.
I presume you mean these lists?
http://www.phmc.state.pa.us/bah/dam/rg/di/r45_MineAccidentRegisters/r45-14AccidentRegistersInterface.htmYou could look through all the Sch-/Sh-/(Sz-?) names of the right time for a John/Jan/(?) who died and was married with 2 or more children. It also could be that he was injured and later died, so not listed as a fatality in those lists but the family remembered his death as connected to the accident?
As for "Stella", I think you should look at:
Paul Mcchancy and Stella "Shustick"
1940:
https://familysearch.org/ark:/61903/1:1:KQCR-LJY1930:
https://familysearch.org/ark:/61903/1:1:XHCW-HCZ"Stella" is born PA but parents b. Austria
I can also see what I guess is Paul's family in 1900:
https://familysearch.org/ark:/61903/1:1:M3M8-P3WI'm having trouble finding Stella earlier or Paul in 1910/1920 but I did find this which gives Stella, mother of a McChancy as "Stephanie Shustick" and says she had a sister Josephine who married a Faber!
http://archiver.rootsweb.ancestry.com/th/read/FABER/2002-07/1026537722Maybe if you can trace Stella in 1920 (already married?) and before it will give some hint about the rest of the family. Her marriage to Paul probably took place in Allegheny Co (where both their families seem to have lived) or Washington Co (where they settled later). His parents are buried in Oakdale, so I would check there first:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=70933348I think you would have to contact Allegheny county for a marriage there, I can't see anything online.