Challenging Tvååker question!

[Glen Johnson]

Who might know a clever way to find out which Tvååker household my ggrandmother worked for as a servant in March 1896?  She was 20 years old; her name was Hilma Amanda Johansdotter.
 
The son of her employer got her pregnant around March 1896 and she gave birth to my grandfather John Albert Johansson on December 19, 1896. I would like to find out who his father was.  Would not be surprised if his given name was Albert.
 
He was not listed on my grandfather's birth or baptismal records.
 
All comments appreciated.
 
Glen Johnson