We have a picture book at home that includes pictures of Grandparents and such. This weekend we went through the book and he reacted biggest to the Seckman page.
When asked who Jim was he said 'Gampa.'
When asked who Cindy was she was sometimes 'Gampa' and sometimes 'Nana.'
I asked him if Grandpa had a puppy. He smiled and panted (daycare taught him this) and said 'Bubba' repeatedly.
Then it turned into a game 'Gampa heh-heh-heh-heh Bubba. Gampa heh-heh-heh-heh Bubba.'