Your great-grandfather was born/registered as Fred Miller Lander in 1876.
1881 Swanage, Dorset RG11/2098
Joseph Lander, 47, stoneminer, b Sutton Weymouth, Dorset
Sarah A Lander, wife, b Worth, Dorset
Job L, 17, son
Hubert L, 15, son
Frank L, 12, son
Fred L, 5, son
Walter L, 3, son
Jessey L, 11m, son all b Worth
Joseph Samuel Lander was one of the children born to Henry and Kezia in Sutton Poyntz (in 1834) so the connection is now made.
I can give you more information when you have confirmed what you want.
Richard