Take a look at select_related(), it may be of some help, depending on
how you define "parent" and "child".
http://www.djangoproject.com/documentation/db-api/#select-related

"Returns a QuerySet that will automatically “follow” foreign-key
relationships, selecting that additional related-object data when it
executes its query. This is a performance booster which results in
(sometimes much) larger queries but means later use of foreign-key
relationships won’t require database queries."
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