Send mail for each Child records when Parent is updated

[Rajan_PACHCHIGA]

Hello, I have a scenario for project tracking where in I maintain parent child relationship in the same table as below.

When the owner Email 1 changes status of Activity 1 to “Completed”, I want to send an email notification to Email 2, Email 3, Email 4 and Email 5 to start their respective activities.

Help me achieve this.

Thanks.