Jan Werner Jonkers was born about 1889 in Malang, Indonesië. He died⁽¹⁾ on 4 Feb 1934 in Maastricht, L. He married⁽²⁾ Agnes Hubertina Siepers on 7 Jan 1919 in Sittard, L.
Agnes Hubertina Siepers
Agnes Hubertina Siepers⁽¹⁾ was born⁽²⁾ on 24 Feb 1890 in Schin op Geul, L. She married⁽³⁾ Jan Werner Jonkers on 7 Jan 1919 in Sittard, L.