Thanks for the replies!
I have seen where 1) each twin may be registered separately on their own certificate; 2) both may be listed on the same certificate; 3) there may be only one certificate with one name for various reasons - admin error, parents choice, etc. I didn't see another certificate for that date.
Here's what I know so far: My GGF's parents were Philip(p) Schmidt & Caroline Hofmann and they immigrated from Germany (no further info).
They arrived in NYC Aug 1883 with Philipp Jr (nine); Christian (eight); Marie (six); Carl (five); Heinrich (four); and George (6 months).
I have found obits, death certificates and cemetery records on both parents (yay!) and all children, except Carl and George. Thankfully I have a paper trail on George until 1945 so I will eventually find his place/year of death and where he is buried.
Carl is my biggest mystery. I have only found him on the passenger list and the 1885 NJ Census. Since he is not mentioned in any of his brother's obits, I'm theorizing he died before Philip Jr in 1925.
I decided to see if I could find German records for any other insights into the family. Here's what I've found so far:
- Michelbach (Aarbergen) Hesse BC for Christian Ludwig Schmidt born Dec 1, 1875 (exact BD match) to Philipp Schmidt and Karoline Schmidt (nee Hofmann). Maybe not my GGF bc middle name Ludwig is different than the Alfred I found on one record.
- Michelbach (Aarbergen) Hesse BC for Marie Elisabeth Schmidt born July 17, 1877 (exact name and BD match) to Philipp Schmidt and Karoline Schmidt (nee Hofmann). Promising!
- Michelbach (Aarbergen) Hesse BC for Philipp Georg Schmidt born Feb 11, 1883 (exact BD match) to Phillip Schmidt and Karoline Hofmann. I could use a little help interpreting this attached certificate - especially the writing in the margin. I think it says they didn't name the child at birth but came back later and named him Philipp Georg?? Was surprised to see Philipp as the first name but have learned that it was not uncommon for siblings to have the same first names in Germany during this time period.
- Michelbach (Aarbergen) Hesse BC for Karl Adoph Schmidt born June 18, 1879 (the same date as Henry's. I do not have a known birthdate for Karl - only an estimated age in 1883) to Philipp Schmidt and Karoline Schmidt (nee Hofmann). So...not my guy/wrong family? Twins? Philip Sr mixed up C/Karl and Henry's birthdates (sadly his wife died in 1884 just 10 months after arriving in the US)?
I'm new to German genealogy research so still have a long way to go to confirm/exclude any/all of these records. I know all these names are very common so I have a challenging journey ahead of me. I greatly appreciate everyone's input!!