If the demonstrative points to the mudaf ilayh, place it immediately before that noun.
كِتَابُ هَذَا الْوَلَدِ
Meaning: the book of this boy. هَذَا points to الْوَلَدِ.
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When the Demonstrative Points to the Mudaf Ilayh
Demonstratives inside an Idafah
If the demonstrative points to the mudaf ilayh, place it immediately before that noun.
كِتَابُ هَذَا الْوَلَدِ
Meaning: the book of this boy. هَذَا points to الْوَلَدِ.