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santhosh konathala 8santhosh konathala 8 

How to do field update of three child records of different objects from parent

Do you want to populate the field of parent object to child then create the formula fields on child object and that get updated actomatically.

If this is not the case or you need to customize the value using some custom logic then go for trigger that will update the child records.

Please let me know if this helps you.

Instead of trigger, try the option of using Process builder. If the update logic is very complex, then go for Apex Triggers.