Preparing Lucas for the arrival of his baby sister

Many friends asked us what do we do to prepare Lucas for the arrival of his baby sitter. At first, we were quite puzzled. It was like what....we have to do that. So, we asked around and tried to read the parenting book. To be honest, there is not much written and every parents have their own methods.
We tried a few methods ourselves. First, we asked Lucas if he wants a 'mey mey' (baby sister). He said 'No'. He associates 'mey mey' with my niece whom he called 'mey mey'. So, we stopped using the word 'mey mey' to ease the confusion. We then asked if he wants a baby sister. Most of the time, he ignored the question. Once, he replied 'I want only 1 baby sister. I don't want 2 baby sisters!' We gladly said yes, you are only getting 1 baby sister.
I showed him my big tummy and told him numerous times that his baby sister is sleeping inside. When I asked him the question, 'Where is your baby sister?', he ignored the question most of the time. Once or twice, he will point at my tummy and said 'There'.

Hmm...I don't think he quite get the concept yet. I suppose it will only sink into him after the baby is born. I can tell that he will be extra clingy once the baby arrives. It would be Mummy this..and Mummy that.