David Halle b: 1836 Schnaittach--looking for further information

Looking for David and Jette Halle of Schnaittach, Germany.
Known children are:
Bertha/Berthe b: abt. 1869
Nathan b: 3/7/1870
Lina b: unknown
J. b: unknown (male)

Both David and Jette died in Germany prior to WWII.
Bertha married Ernst Haas & came to US but returned to Brussels where she died about 1941.
Nathan came to US and died in San Diego in 1954. Never married.
Lina married Karola Kronheimer, they lived in Munich until the war---after that? Three of their children immigrated to US.
J. Halle is mentioned by Nathan Halle on a passenger list as living in Munich. No other information on him.

I have a subscription to Ancestry.com and have scoured it looking for all of these people. I am interested in connecting with others looking who are researching these people or suggestions of different places to look for more information. I am looking for help beyond Ancestry.com.

Thanks!