Hard to read but 1871 looks to me like
Thomas Shimmin, head, 52, Mariner, b. IOM Peel (at Kinsale)
wife Cath.,50, Mariner's wife, b IOM Peel
Charlotte, daught, unmarried, 22, B IOM Peel
?Rob? Shimmin, G Son, unmarried, 10, Scholar, b IOM Peel
Just looks like the four of them in the household. I have relatives at No 9 at the same time.
Will try and check out 1891 for you if of use