My great grandparents died in the Netherlands. Would like to locate their graves and possibly have photos taken of their headstones or the area where buried.

Per(Peter)NILSSON was born 07 July 1841 in Vitmolle, Kristianstadt, Sweden and died 11 May 1891 in Rotterdam, South Holland, Netherlands. He died working on a cargo ship.

Johanna DE WAAL was born 17 May 1859 in Zierikzee,Zeeland, Netherlands and died 02 May 1896 in Rotterdam, South Holland, Netherlands.

They were parents of (my grandmother) Bertha Adrianna NILSSON born 30 April 1883 in Delfshaven ; Johanna Cornelia NILSSON 05 Jan 1885; Johanna Cornelia NILSSON 22 July 1886; Adrianna Lena NILSSON 13 Nov 1887; Petronella Mathilda NILSSON 05 Aug 1889; Jacoba Andrea NILSSON 16 Apr 1891; Maria Johanna NILSSON 12 July 1892.
Her sisters were born in Rotterdam.

I believe there may have been a boy child born in 1881 that did not survive but have no definite information on his name or date/place of birth.

After my great grandmother died my grandmother and her sisters were placed in an orphanage. There is no documentation found as to the name of the orphanage or its location. Would very much like to find out how and where this information may be located. If the structure is still standing would appreciate a photo of it.