Antonsen - Fontenay

Hi, I am looking for some help with my Norwegian heritage. As my Norwegian is non-existant, it is rather difficult to decipher everything. Any help from a clever detective would therefore be very much appreciated! [:)] Many, many thanks! I am looking specifically for the parents and grandparents of Hans Pet(t)er Antonsen (Sletten) (°26/09/1865, Ullensaker (Nordby) - † probably 06/11/1918, Antwerp (Belgium)). He married Cornelia Frederica (le Sage) de Fontenay (descendant of French-Danish nobility). In his batismal record (29/10/1865, Ullensaker, Akershus)) Anton Julius Hansen & Marie Halvorsdatter seem to be mentioned as his father and mother? Furthermore, it seems his father left him and his mother with the family of David Davidsen and paid for his upbringing (source 1 and source 2)? Documents in Antwerp also mention the names of Anton Julius Hansen & Marie Halvorsdatter, and state that Hans Peter arrived there in 1887 as a seaman, where he married on 26/03/1892. 1. Anton Julius Hansen Could anybody confirm whether he was born in 1841, Kristiania or in 1834 (source 1 and source 2)? (Or even another date?) Which seems the most likely? And where was he born? Can we find out the names of his parents? 2. Marie Halvorsdatter (Nordby?) I think I read on the baptismal record of Hans that Anton lived in lejermål with Marie. Does this mean there is no marriage certificate? If so, is there a way to find out which Marie Halvorsdatter this is? As she is said to be 28 years old in 1865 and born in Ullensaker, she is perhaps the Marie Halvorsdatter born on 14/08/1838 in Hitlon, Ullensaker or is it more likely that she is the Berthe Marie Halvorsdatter Dahlseie born on 14/06/1838 in Ullensaker? Is this her baptismal record and if so, do I understand correctly that she is part of twins? Who are her father and mother? Where can I find more information about them? Many thanks for you help and I am of course always available for help with Belgian genealogy!