I found Derk in the Dutch databases.
At his marriage to Anna Nichoff in 1891 his parent's names are listed as Henry Baar and Martha Dyke. https://familysearch.org/pal:/MM9.3.1/TH-266-11134-3855-69?c...
He was born in Uithuizermeden (province of Groningen) on 01 Apr 1861, son of Hindrik Jacobs Baar and Martha Dijk.
As a witness at his marriage is listed a Jacob Baar, living in Paris, Mich.
This is Derk's half brother.
Derk had another half brother, Willem, who also left for the USA
Dad Hindrik Jacob was married before.
These are the details of the family:
Hindrik Jacobs Baar
Born Uithuizermeden 03 Feb 1823 at 05.00 hrs
Died Uithuizermeden 07 May 1864 at 23.00 hrs
Son of Jacob Hindriks Baar and Fenje Heines Kooi
Married 1) Uithuizermeden 21 Nov 1846 to:
Grietje Willems Oosterhuis
Born Oosternieland (Uithuizermeden) 08 Jan 1826 at 04.00 hrs
Died Oosternieland 01 July 1857 at 04.0 hrs
Daughter of Willem Jans Oosterhuis and Lijzabet Tonnis Sikkenga
1. Jakob Baar (male)
Born Uithuizermeden 13 May 1847
Married ‘t Zandt 14 May 1870 to:
Born ‘t Zandt
Daughter of Harm Tonnis Sikkenga (his uncle) and Antje Eltjes Sijtsema
They left for the USA in 1870
2. Willem Baar (male)
Born Uithuizermeden 23 Dec 1848
He left for the USA in 1872
3. Heine Baar (male)
Born Uithuizermeden 07 Apr 1850, died 15 Mar 1858
4. Elizabeth Baar (female)
Born Uithuizermeden 21 Apr 1851, died 13 Dec 1858
5. Fenje Baar (female)
Born Uithuizermeden 02 Dec 1853, died 23 Nov 1864
6. Jan Baar (male)
Born Uithuizermeden 09 Dec 1855, died 10 Feb 1859
Married 2) Uithuizermeden 27 June 1860 to:
Born Uithuizermeden 13 Sep 1819 at 09.00 hrs
Daughter of Willem Pieters Dijk and Anje Roelfs Kooi
Widow of Klaas Sijmens Kooi
(her cousin, son of Simen Roelfs Kooi and Antje Pieters Hof)
7. Derk Baar (male)
Born Uithuizermeden 01 Apr 1861 at 12.00 hrs
After the death of Hindrik Jacobs Baar, Martha remarried (her 3rd marriage) in 1865 to an Edze Pieterman.
And this Edze Pieterman leaves for the USA in 1881 with wife and 4 children.
The strange thing is, Edze and Martha never had any children..... If you want me to look into that, please let me know.