Johann Wilhelm Caspar Knelangen -- born: 11 Jan 1860, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany. -- bapt: 13 Jan 1860, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany, at Beatae Maria Evirginis.
Heinrich Anton Knelangen -- born: 1 Dec 1862, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany. -- bapt: 2 Dec 1862, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany, at Beatae Maria Evirginis.
Maria Catharina Antonia Knelangen -- born: 9 Oct 1865, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany. -- bapt: 10 Oct 1865, Friesoythe,Cloppenburg Co.,Lower Saxony,Germany, at Beatae Maria Evirginis.
A Helena Meyer married Heinrich Meinhard Knelangen in Friesoythe, but
I don't know whether it was this same Helena or not. He does die
in 1867 which would free her to remarry in 1871, but no previous marriage
is mentioned on the record of her 1871 marriage to Hermann Eilers.
The 1871 marriage is certainly this Helena since it names her parents.