Count Total Children Rows of 1 Parent Row

I'm trying to create a sheet summary field that will hold a total count of Children under a specific Parent, regardless of the status of the child.

I've tried to use the following, but I get #UNPARSABLE:

=COUNT(CHILDREN([Parent])

I presume I need to somehow callout Key Tasks column, but I'm struggling.

Thanks, in advance for any assistance offered 😊

Answers

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