according to recrds on the LDS site William Wager married Nellie (Neltje) Boss on 23 Jan 1905. He had a brother Christian born 17 dec 1883. Confused with yur second para:

Christian Wager is William Wager's Father.
William wager borne Mar 1886 died 8-4-1952
I have no death certs for Christian, that's why I'm looking for his wife's maiden name first name Charlotte Wager I believe they were not married here. Wher can I find info on them in the Netherlands?

Also Nettie was married to John Haveman both married her in USA. Have found different spellings of her name Nattia,Nettie & Bos/Boss lived in Grand Rapids Michigan
No death cert for Nettie either.