Pehr Olson

I would like to know the names/dates/et. of ancestors of my great-grandfather Pehr Olson, who was born in or near Yngsjo, Sweden March 3, 1835 and immigrated to the US in 1866. He came with his wife Kerstin Nilson Olson and young daughter, Elna, and settled in Rock Island, Illinois. His brother, Nils, had already settled in Rock Island. Their mother, Bengte, was also with them.

       I would welcome any information and would be glad to share what I know.