Let me jump in here, may be able to give you some ideas for research. The secret to genealogy is to collect all information and records from the known places where they lived. Each item is likely to provide another piece of the puzzle. Where and when did Jonathan die? By his death record, do you mean his death certificate? Do you have a definite death date? Have you checked for a microfilmed newspaper death notice to see what details it had? You can order microfilmed newspapers for the two days following death via your reference librarian and the free interlibrary loan program. She has a book that tells her what newspapers were in print in particular areas in particular years. Also, the microfilmed 1900 USA Federal Census gives date of immigration, whether naturalized or alien, date of naturalization. The microfilms are a gold mine of information and you can check and see who lives in their house (aging parents, recently-immigrated family members) and who lives next door (they often moved from state to state in groups and married their neighbors). You can also contact the historical society in the USA county where he lived and ask if they have a volunteer who will help you obtain documents and excerpts thereof on your family for a donation to their society. I have done this and it was the best money ($50) I ever spent, I got back tons of info. Be sure and ask them about wills, land records (;atter gives last place lived), and especially about USA county marriage applications. These circa turn-of-the century (1900) marriage applications (not to be confused with certificates) often given information on parents of the bride & groom with definite addresses. If you subscribe first to their periodical, which tells about the county and its early inhabitants, they will likely leave no stone unturned in helping you. Also, check your libraryshelves for USA county history books, and you can order additional ones (don't need exact title or author, just ask for any/all history books regarding that county and state) via the free interlibrary loan program. I have done this, and to my amazement they had two pages on my humble families! Jean