[HPforGrownups] Why is Draco an only child?

[Emma Hawkes]

No: HPFGUIDX 126992

Given his family's obsession with bloodlines, why is Draco an only child?

* His parents are too inbred to produce more children.  (Consider how 
similar their nordic looks are.)
* His parents are trapped in a loveless marriage.  (Arranged 
marriages would fit with the bloodlines obsession.)
* His parents chose not to have more children.  (Draco, like the 
others in his year, was conceived and born almost at the height of 
the last war.  Perhaps fewer people chose to have children at that 
point?  That would explain why there seem to be more students in the 
school overall than can be accounted for by multiplying the number of 
kids in Harry's year.)
* His father has a war wound.  (Consider the impact of an ill-aimed 
jellylegs curse.  No really.)
* He had siblings who were squibs who were subject to infanticide. 
(Imagine the reaction of Draco's folks if they had a child like 
Neville).
* He has siblings who are much older than him or much younger, so 
Harry has not yet noticed them.

Any other thoughts?

Emma