He's 20mths old and his favourite people are me, my mother and my father-in-law. He rejects his dad, my father and my mother-in-law if his favourite people are around. Whilst it doesn't bother me when he favours my FIL or my mother over me as I know it's me he loves best and will keep coming back to me for reassurance every so often, or if he's hurt it's me he wants, it does bother me that his dad is so low in the pecking order and I feel his hurt.
Is there anything I can do, or his dad, that will improve things? Is this just a toddler thing and will is favourite people change as he gets older? Why is it like this?