Hi Teju,
Try this in your page load:
if(!textbox1.Enabled)
{
rfvAdd1Insured.Enable = false;
rfvAdd1Insured.ValidationGroup="";
rfvAdd1Insured.ControlToValidate = null;
}
or
Enable or Disable ASP.Net Validation on client side
rfvOther: is a Required Field Validator
ValidatorEnable(ValidatorContronName,Boolean);
You can implement this function according you logic.
It'll solve your problem.
--Amit