I found another child of Benjamin's apparently:
Daily Picayune, New Orleans, LA 5/11/1882
On Wednesday, May 10, 1882, at 4:15 o'clock, P.M., EMMA M. KARSTEIN, wife of Chas. W. Ober, aged 26 years 4 months and 23 days.
The funeral will take place This (Thursday) Evening, at 4 o'clock, from the residence of her brother-in-law, Jno. Vegas, 115 Washington street. The friends and acquaintances of the family are respectfully invited to attend.
California and Philadelphia papers please copy.