1950 Census - Relationship to Head of Household says NEA . I cannot find a birth or death for this 1 year old

Researching my family and am trying to find out who this boy is.

He is listed on the 1950 Census along with my 2 cousins but they have never been aware they had a potential brother.

 I cannot trace him other than that record.

Can anyone help with the abbreviation NEA?