Hello Dash.
We are still looking for Census information for James Lewis born about 1834 Wales and Annie (nee Powell) Lewis born about 1837 Wales who immigrated abt 1854. (Only have them in 1900 at the moment)
It may be worth you trying to get in touch with the owner of anc..try tree referred to in reply 9. They have a James Lewis and Ann Powell listed as the family I picked up in reply 6/7/8/9
Is there a link between James Lewis 1834 Wales and Arthur Lewis 1861 Wales ?Is there a link between Owen Ellis and Richard Ellis to the Powell family ?Clutching at straws to try and get you further information. There is someone who will do marriage license look ups in Allegheny and if you are looking for something else then
please ask they may assist (3rd name on list) Also first name on the list says would look ups for obituaries. Could this be worth a try to see if you can get the death record for John Henry Jones and Jean/Joan Davies/Jones ? The last sighting was the 1910 Census

and:
James W Jones who we last saw as a widow in 1920 with daughter Addie/Adelaide and who you think died in 1925
His wife Ellen Morris/Jones who we last saw in 1910 Allegheny and who you think died in 1917. Both buried Homestead Cemetery.
http://www.rootschat.com/links/08j4/An update so that you can see where I am with the search, looking for the link between Ellis/Lewis and Powell but nothing yet. Reply 61 with Owen Ellis, I have tracked them back to 1860 Pennsylvania and 1851 Wales Census. (Will post below - so that you can see them) Only 2 options for a marriage for Owen and Emma that I can see - the first one Owen Ellis to Emma Jones would be March 1842 Bangor (so again that would be back in North Wales) and the second Owen Ellis to Emmett Martell June 1843 Narbeth. Wales. (Narbeth is in a direct line with Merthyr as the crow flys but seems to be 74 miles from Merthyr)
The second looks the best option bearing in mind where Owen was born

and that the spelling of his wife is Ernet on the 1851 Census

Possible option of Owen on the 1841 census but I need to spend more time looking into that option. Likewise with Emmett Martell, I can find and Elizabeth, Margaret and Mary but no Emmet/Emma and the IGI for Narbeth isn't covering 1820

The passenger lists are not throwing up anything for Owen, Emmett/Emma and Martha which is between 1851/1856

On the 1871 Census with John and Mary Powell - Richard Lewis age 23 years - 5 BMD records covering March 1846 -June 1848 for Richard Lewis in Merthyr Tydfil which isn't helping a search down that line. No immigration record coming to light for him either.
Arthur Lewis 1861 Wales married to Mary Ann Jones (daughter of John Jones and Mary Ann Powell - sister of John Powell) It will be difficult to track John Jones back to Wales without further information - Jones is quite a prolific surname in Wales.
1871 Census for Builth, Brecknockshire, Wales would throw up an option for him (but sadly no Richard in that household) and since he immigrated later than the Powells, its not definite he came from Glamorgan. Think we have covered the family of Arthur and Mary Ann and established the death dates for them.
Annie Powell (sister of John Powell born abt 1837) married to James Lewis, no other sightings in Poughkeepsie. New York, other than the 1900 Census showing just the two of them. How do you know they lived in Poughkeepsie ?

No immigration record for them either. So lots of different avenue's tried and no connections.

These are the 2 census that refer to Owen Ellis
1850 Wales CensusOwen Ellis 31 Born Llanllyfni, Caernarvonshire, Wales
Ernet Ellis 30 Born Nuntoion, Pembrokeshire, Wales
Martha Ellis 4 Born Llanginog, Glamorgan, Wales
1860 Hazle, Luzerne, Pennsylvania Owen Ellis 40 Born Wales
Emma Ellis 40 Born Wales
Martha Ellis 13 Born Wales
David Ellis 3 Born Pennsylvania.
Ellis J Ellis 1
Probably best to keep all the information in one place for the moment so that others can see the relationships between the families otherwise things get duplicated. Hope I have covered everyone.

If I have made any mistake with these relationships, perhaps you can let me know so that we can correct. It does get quite complicated and involved when the names are the same or similar.