Margaret Newsham & Michael Mullins

Does anyone have information on Margaret Newsham or Michael Mullins?They were married in 1878 in Marylebone,Middlesex, England. They are listed in the 1881 Census. He was they were both 36 years old.They had five sons listed and all had the Newsham name, indicating Margaret's second marriage was to Michael Mullins. The boys name were Thomas 20,William 18, Alfred 16, George 14 and Arthur 8.All born in Marylebone,Middlesex,England.
My grandfather's name was Arthur Newsham and he had brothers with the above names, but I have been unable to find any information on his parents. I feel that the above family is that of my grandfather, but have not found a way to prove that. He had six brothers, but only two are listed in the census. If anyone has any leads on this family I would surely appreciate it. Thank you!