If the demonstrative points to the mudaf, place it after the complete idafah.
كِتَابُ الْوَلَدِ هَذَا
Meaning: this book of the boy. The demonstrative points to كِتَابُ, not to الْوَلَدِ.
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When the Demonstrative Points to the Mudaf
Demonstratives inside an Idafah
If the demonstrative points to the mudaf, place it after the complete idafah.
كِتَابُ الْوَلَدِ هَذَا
Meaning: this book of the boy. The demonstrative points to كِتَابُ, not to الْوَلَدِ.