hello Wiggy Hobbes You have some records that match mine. I googled names from my family tree and your data came up. You are following a John Hugh and daughters who came to Australia. I am following back my William Hughes, of London, born Penzance Cornwall, as was his son Robert. I know this from the family story, so have been trying to locate them. I also know that there was a Rhoda in the family, again the family story.
William married to Rhoda Watson, a widow in 1859. In 1861 Census in London he is William Hughes, has a son Robert Hughes with him, and she has some (of her?) children under the name Watson and Madison. The 1851 Census for the only William Hugh born in Penzance is for one married to a Mary Bryant Hugh with children John, William, Elizabeth, and Robert Gendell Hugh, all born Penzance. This must be my Robert Hughes, I do not have him with this middle name anywhere else to confirm it is him. I can only go on the birth place and he is the only one for that. I see on your posts you have linked these two families together despite the difference in spelling of the surname. I had come to this conclusion also. I hope it is correct. I have also used the occupations from Census and bdm as lath render, joiner and carpenter to say that William Hugh/Hughes is the same person. I am please (excited) to see you have generations further back.