Dear Friends,
There is a very famous story . Once Devrishi Naradji got a very special mango fruit to kailash and gave it to lord Shiva. On hearing about the divine fruit, devi Parvathi called her 2 sons (Karthikeya and Ganesha) and asked them to cut the fruit and share it half - half. But Naradji said that the fruit should not be cut into half - as it would loose its divinity and other special qualities .
So Lord Shiva decided to keep a test for his 2 sons , to find out that who was really worthy of having this divine fruit . He said that the one who could go around the world and come back first to kailash , would get the fruit as a reward.
Immediately karthikeya set off in his peacock in a journey around the world.
But Ganesha did not even move from his place. He asked Naradji - What do you mean by "ammai-appan" (mom-dad) and what do you mean by "Ulagam" (World) ?
Naradji smiled and replied, " ammai-appan than ulagam, ulagam than ammai appan" (Mom-dad are the world and the world is nothing but ur mom-dad)
Hearing this, Ganesha immediately walked and made a round of the place where his parents (Shiva - Parvathi) were seated. He declared himself as winner, everybody acknowledged his wisdom and he got the reward (divine fruit) .
When karthikeya came back after making a round of the world , he was furious to know that his brother had cheated and won the competiton. He left kailash, he left his parents and he went and sat in Pazhani malai (Pazhani mountain in Tamilnadu ). This pazhani temple is very famous temple in the south.
This story happened when both karthikeya and ganesha were small kids.
But unfortunately in DKDM, they din't show this story. They haven't even introduced Ganesha .