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Sasidhar Reddy BSasidhar Reddy B 

Update checkbox on parent when any of it's child records are updated

I have 2 objects contact(Parent) and loyalty__c (child), i have checkbox field (Loyalty_Eligibility__c) and text field(Loyalty_Lifetime_value__c) on both the objects so when this check box is checked and text field entered on any of it's child records then the parent field (Contact_Eligibility__c,Contact_Lifetime_value__c) has to be updated and viceversa.
You may need triggers in both the objects to acheive this.

But, you need to be careful in making sure that you don't end up in recursive triggers.