Get Child Accounts from Parent Account Record

Summary

Need to fetch list of child accounts from parent account record in groovy

Content

Need to perform update on the child account whenever parent account attribute got an update. To perform that, need to fetch list of child accounts in groovy but the appendViewCriteria is giving an error. Please tell me a way to fetch child accounts or is there any other better way to perform the update operation on child accounts

Before Update Trigger:

def ParentId = PartyId

def OrgVo = newView('OrganizationProfile')
OrgVo.appendViewCriteria("ParentParty.first().PartyId = ${ParentId}") //also tried ParentParty.PartyId = ${ParentId}
OrgVo.executeQuery()