"What is that lady's name again?"

Collin was talking to us and stopped in mid-sentence to ask, "what was that lady's name again?"  We had no idea who he was talking about and asked him to describe her.  "She had grey hair and I watched movies at her house".  Oh!  He was talking about Grandma H.  It's only been 5 months since she passed and Collin has already forgotten she was his grandma and what we called her.  I wanted to cry knowing that he was not going to have a memory of her like he will with my mom, Mimi.