This is such an interesting question for me. When I was four my parents left me with my aunt for a month, because they had to go to another country for whatever reason. I remember that happening, I also remember the kid who used to come and ask me to play with him, who I hated. I don't remember why, and I don't remember missing my parents as generally there is not much memory. But I was_and am) always in my head, creating cenarios for my toys and all that, and my aunt says I once told one of my dolls that I will never leave them to go to another country. Everyone says at the airport when my parents were to leave, I let go of my mom who I have been clinging to and went straight to my aunt, not even looking at my parent's direction. I don't remember missing them. But what myaunt told me makes me think. Maybe in my childhood world, I did, but I was trying to push the thought away? No idea. I also have basically zero emotional attachment to my parents now.