Port Washington, Dist. No. 15, Port Washington, Washington County, Wisconsin, is where I find the Chapin family in the 1850 U.S. Federal Census, and now we get to see the names of all the others in the household, as well as some occupations.
O. Chapin, age 59, born in Massachusetts, works as a Forwarder. Relationships to head of household are not indicated (this doesn't happen until the 1880 U.S. Federal Census), but based on other research, relationships are as follows:
O. (Orramel) Chapin is the Head of HouseholdSusan Chapin, age 51, born in Massachusetts is WifeH. H. Harrison, age 39, born in N.Y. is Son-In-Law and is also a ForwarderJane E. Harrison, age 27, born in Massachusetts, is DaughterAlfred R. Chapin, age 25, born in Connecticut, is Son and works as a ClerkSarah H. Chapin, age 16, born in N.Y. is Daughter-In-Law, who married Alfred that summer 1850 (yes, at age 16)Henry Harrison, age 4, born in Illinois, Grandson (Jane and H. H.'s son)Lena Hamit, age 15, born in Germany is perhaps a servant.
I don't show it in this image, but William and Sarah Toogood are listed just above O. Chapin. I believe that they are Sarah H. (Toogood) Chapin's parents.