Contact the Cass County NE Vital Records and ask if they have the death certificate for an H Peterson who died 3 Jan 1889: is buried in Riverview Cemetery and ask how much it would cost to get it.
Addr: 346 Main St. #202
Plattsmouth NE 66048
Hopefully it will have his full name, maybe his wife (Emie could be short for Emma...which could be a middle name). Possibly Alfred might br listed as an informant.