Site https://www.wiewaswie.nl/ has 11 hits on Albertus Johannes Castein, 7 marriages, 3 birthes and 1 death in Holland. I do not see a Rossiter connection. I see in the yearindex 1901 for Amsterdam on family search the birth registration on 29 Oct of Castein, Johs Albertus, register 11, page 76. See the record on
https://familysearch.org/pal:/MM9.3.1/TH-267-12699-114163-20... or look at the attachment.
His parents married 14 June 1882 in Arnhem and divorced on 23 May 1905 in Amsterdam, reg. 1, page 37. For the marriage see:
https://familysearch.org/pal:/MM9.3.1/TH-267-11678-165020-34... It shows that the groom is 27 years old and born in Nijmegen. His parents are Evert Castein and Everdina Christina Janssen. The bride is Hendrika Frederika Smit, 22 years and born in Arnhem, daughter of Frederik Willem Smit and Elisabeth Kuster

Jan in Amsterdam.