Høyem/Høiem/Jenssen/ present day relatives?

I am a novice Geneologist. I have managed to trace my ancestors back to Sør-Trøndelag/Byneset. My gg-grandfather (Isak Hoyem) emigrated to America in 1888 with his brother (Jens Hoyem). Jens returned to Norway and after un-americanizing his last name (back to Høiem) shows up on the 1900 census. His son took the name Ole Jenssen. Looking for help (online or other ways) on how to trace his family to present day. Thank you.