when they see him/her/them [obviative]
when s/he sees him/her/them [obviative]
when s/he or they [obviative] see them
when s/he or they [obviative] see him/her
when they see him/her/them [obviative]
when s/he sees him/her/them [obviative]
when s/he or they [obviative] see them
when s/he or they [obviative] see him/her