1900 and 1910 Census

I was researching my husband's family again and decided to revisit the census. I'm really trying to figure out where to look for John Olsson as it seems he was a ship's captain. Well, as I searched the 1900 census again, I was able to see that (using XnView to ligthten it) the column of "mother of how many children" and "number of these children living." I had never noticed it before. I knew John Olsson was the father of 2 children and their names. Now I knew that he was the father of three. I could only surmise that he/she had died. I started searching and found that his first son John had died as an infant. I haven't found any information on John as a ship's captain, but I was able to add information to my tree.