When Child Case is Merged, update Parent Case and Send Email using flow #inSalesforce

When Child Case is Merged, update Parent Case and Send Email 

Prerequisite: There is a checkbox field suppose named ParentCase 

Create a record triggered flow, Case object, on Update,

Criteria: Status equals Closed and MasterRceordId isnull False, only when a record.. selected

Action Element:
sample body, sample subject, email addresses comma separated record.owner.user.email, rich text formatted body is true

Update Element:

Specify condition.. selected, Case object,
Criteria:
 Id equals record.MasterRecordId
 ParentCase equals false
Set:
 ParentCase equals True