Here is some census info that I believe is him and his family beginning with 1920.
1920 Crawford Co., IN: Perry Knight54b. INparents b. IN Mary C.54b. INfather b. Germanymother b. Switzerland Samuel21b. IN Jesse17b. IN Arnold11b. IN Williamfather91WDb. INparents b. KY
1910 Crawford Co., IN: Perry Knight431st margmrd. 23yrs.b. INparents b. IN Mary428children/7livingb. INparents b. IN Richardson17b. IN Annabeldau15b. IN Orvilleson13b. IN Samuelson9b. IN Jessie F.son6b. IN Williamfather83WDb. INparents b. IN
Perry C. Nightb/ 4/186535mrd. 13yrs.b. INparents b. IN Maryb. 5/1865356children/5livingb. INparents b. IN Williamb. 4/188812b. IN Henryb. 4/18928b. IN Richardb. 12/18945b. IN Annab. 12/18972b. IN Arvelb. 4/18982b. IN
(Right above him) William Nightb. 5/183070WDb. INfather b. KYmother b. IN
1880Crawford Co., IN William KNIGHTSelfMMaleW51INFarmerININ Sarah KNIGHTWifeMFemaleW43KYKeeping HouseKYKY James KNIGHTSonSMaleW16INWorks On FarmINKY Perry KNIGHTSonSMaleW11INWorks On FarmINKY
They weren't in Crawford Co before this seemingly.didn't find them in the 1850-1870 census records.Anyway, maybe this will be a help in your research.