The point in dispute is the children (5)
I believe the answer is:
issue
I believe this is a double definition.
'the point in dispute' is the first definition.
(I've seen this before)
'the children' is the second definition.
(issue can mean someone's offspring)
'is' acts as a link.
(Other definitions for issue that I've seen before include "Children; matter" , "Children; important topic" , "Question - outgoing - children" , "Subject, result, or publication" , "One's offspring" .)