But, as Joe will attest, the House of Representatives has nothing on the jealousy and rivalry that strikes many households when a new baby arrives. He wrote about it on his twitter page:

"Back to work next week. In the interim I am dealing with sibling resentment about a new baby brother in town...otherwise all is great."

Mr Hockey came on Sunrise today to tell us that he likes nothing more than spending time with his family.

"The two weeks of maternity leave were the best weeks of my life. They really were," he says.

Yet the atmosphere in the Hockey household has changed since those enjoyable weeks.

His two children, especially his eldest, a son, are showing some unusual behaviour toward their new arrival.

>> Read Joe Hockey's status about baby rivalry
>> Read all Joe Hockey's status updates

Psychologist Jo Lamble had these tips for Joe:

"A new baby is a competitor," says Jo Lamble.

The older siblings are likely to think, "he's also not a good playmate - he just sleeps and eats and poops!"

Hockey says that the younger the sibling, the less concerned they appear, at least in his family.

"With Xavier, it's a little more difficult because he's a bit older," says Joe.

"What are you doing about it?" asked Kochie.

"I'm sleeping in Xavier's bedroom. In his Thomas The Tank Engine bed!"

Have you had similar experiences in your family? Help Joe out and leave a comment...