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Ram ChaturvediRam Chaturvedi 

How data appear in child record after undeleting parent record in lookup relationship .

Means how salesforce Mange it internally ?
James LoghryJames Loghry
The following document has a pretty verbose description on how Salesforce handles deletes across the various relationships: https://help.salesforce.com/HTViewHelpDoc?id=relationships_considerations.htm&language=en_US (https://help.salesforce.com/HTViewHelpDoc?id=relationships_considerations.htm&language=en_US)