A few things have got me thinking about my own childhood recently.
My mother used to make a thing about how my little sister liked her cuddles. Which would be fine - except she gave her cuddles, but never showed physical affection to me. I remember it used to hurt when she said "DSIS likes her cuddles" but I never said anything.
When my best friend moved schools when I was 10, I remember she hugged me goodbye, and I actually didn't know how to hug her, as it's not something I had any experience of.
As an adult I'm quite a tactile person. We had cats when I was little and I was always very affectionate with them. I honestly believe that if we didn't I would be pretty fucked up about touch!
I don't think my mum preferred my sister. She treated us differently in a number of ways and this was one of them.
But to not cuddle one of your children at all. That's odd, isn't it?