Weiland/Weyland family tree

I am researching (in Australia) the family tree of my mother's family - Weiland/Weyland. Her great grand-father is Johann Ernst Friedrich Weiland/Weyland, born in 1820. He was a miner from Clausthal, Hannover, Germany. He married Johanne Hammer, and they migrated to Australia with 4 children (named on the ships list: Johann Carl Heinrich Christian - 8 years old, Ernst Philipp - 5 years old, Carl August Wilhelm - infant, and one other child) in 1854-1855. Ernst Philipp is my mother's grand-father.
Does anyone have any information on Johann Ernst Friedrich Weiland/Weyland, his parents, his brothers and sisters, or anyone in his extended family?
If not, any websites on the internet I might find some information would be much appreciated also.
Judy Gommers