To have DS1 refer to himself as mummy's precious first born?

[rosalux]

just that really. opinions?

My youngest describes his sibling as the practice baby.

My older brother is the second child but first male child. He is know as "son number one" by everyone .

My eldest is 12, I called him 'my precious first born' in front of his pals when they called for him (to embarrass him, obviously).
He now says to his little brother (9) that he is my precious first born, and his brother just says "I know, but I'm the favourite".

It's just a joke in our house, so I'm presuming it's the same for the OP (i really don't see what's wrong with it! )