Is it true that parents favour one child over another? Does this mean that their parents love them less?

I am absolutely certain that all parents strive to love all children equally. It is undeniable though that some parents might resonate better with one child better than the other without intending to do so. Personalities and temperaments can be different so it all boils down to what naturally happens. I'd say parents love equally but it manifests in different ways, depending on what is best for the child. In my case, I was clearly daddy's girl while my brother was mommy's boy and it was all good. Worked out well for us.