I can tell you that one child is Angelique Leigh Landray, who abt 1875 md. Manfred Percival Olton in Georgetown, Demerara-Mahaica, Guyana. I hope that helps. Let me know if you learn anything new. Thanks so much.
And Samuel Francis LANDRY (I just found - 1 June 2017) died on 2 February 1872. He was a lawyer, trained at the University of Leyden, and editor for the R0yal Gazette. see.
Barbados Globe, (Bridgetown, Barbados) • 02-12-1872 • Page 2