Visiting Grandpa<br>Tyler visits his grandpa on Saturday. He meets grandpa at the nursing home. They drive to the park. Grandpa tells stories while they feed ducks. Tyler treats grandpa to ice cream before driving home.
Tyler's grandpa and grandma are at the nursing home.
We only know that Tyler visits his grandpa at the nursing home to take him on an outing, but we don't know anything about his grandma. The algorithm assumes only grandpa is there, because grandma is not mentioned.
( z1 be-located-at :ARG1 ( z2 and :op ( z3 person :ARG0-of ( z4 have-rel-role :ARG1 ( z5 person :name ( z6 name :op "Tyler" ) ) :ARG2 ( z7 grandpa ) ) ) :op ( z8 person :ARG0-of ( z9 have-rel-role :ARG1 z5 :ARG2 ( z10 grandma ) ) ) ) :ARG2 ( z11 home :mod ( z12 nurse ) ) )