Husbands GGGrandfather

Hello everyone, My name is Tina Tice-Wunder...I am looking for my Husbands family the Thompson's. His GGGrandfather was Thomas Thompson, born Aug 1865 in Norway. His Mothers first name was Ellen, born 1836 also in Norway. His mother came to America in 1898..We thought maybe his father passed in 1897 or early 1898 being the reason she came the USA..She is listed as a widow with 2 children being born to her....He married Hilma or Helina Lendborne born 1866 in Sweden..I have found two different entries were it gives his arrival to America 1877 and or 1886, but I can find this man nowhere. Can anyone please help????..We would like to know his fathers name, maybe the city where he came from, and or his leaving of Norway. Thank you