Medical genetics question: Should the older parent come before the younger parent?

[Genecks]

Imagine I'm making a pedigree

 

In (I)

[] = daddy (born 1978)

() = mommy (born 1983)

 

In (II)

[] = son (first born child)

() = daughter (second child)

 

I..[]--()

......|...

......|...

II.[]--()

 

Or does it not matter which parent was born first?

 

I..()--[]

......|...

......|...

II.[]--()

[Greippi]

Where possible, the male should be placed on the left of a mating line. Then children are placed in order of birth.