Talk to Grandpa

I had a conversation on the phone with my son and family over the weekend. My granddaughter who is only 3 yrs old was actually carrying on a conversation with me. Most of which, I asked the questions and she answers. Then out of the blue she asks...Where is Grandpa? can I talk to Grandpa?.... to put Grandpa on the phone. I am thinking..WTF? This is the last thing I would expect her to ask on the phone, since the last she saw him was over a year ago! I answered the best I could and told her I loved her. After talking again with my son, he apologized......that it must of triggered her to remember him by looking at a few pictures of him recently.
I held it together while on the phone,and told him that's ok. But afterwards....the tears came again. He would of loved that, knowing that his granddaughter wanted to talk to him on the phone. Something so simple to do and we did often, but won't ever happen again. He is so missed by everyone.