Sofie and Zakarias Melby - where did they go?

Hello! On. June 3rd. 1887, Sofie Melby and Zakarias Melby departs from Kristiania with destination: "Madison". I think their parents name are: Magnus Zachariassen Melleby (Melby) and Karen Thorine Olsen Sofie and Zakarias departure from Norway: http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbase&filnamn=emikra1&brukar=&loc=0&spraak=n&postnr=95660&previous=10 Sofie is listed as 18 years old Zakarias is listed as 10,5 years old. Where it states that: - Their destination is: Madison, - Their "line" is A Sharp - Their Ship is: Angelo - Their trip is prepaid By searching this site, I have found that This is the ship: The Angelo: /ships/angel/ and this is the corresponding ships: /forum/roald-amundsen-1872-1928-norwegian-explorer/ I think that they are brother and sister of Richard Melby, who departs the preseeding year: /forum/richard-o-melleby-moe-norway-us-1886-junejuly/ But I have no absolute confirmation here. Now. My questions are as follows: 1. Does anyone find them in any censuses in America? 2. Madison is quite the common name for a place as I have figured, but can anyon give me possible clues? 3. Their trip was prepaid, I guess that this makes it possible that they are brother and sister of Richard. But how could he prepay a trip? Any other information about these two people, are of course more than welcome! Berta