Sequence Execution At Data Flow Task ?

I have one Data flow, which trasfer data into two table (Parent & Child) .

My question is : Is there a way, i can load data first into parent and then child table. because child table getting load first after that parent table loading. (Execution should be Source Parent --> Destination Parent) First , (Source Child --> Destination Child) Second.
In my case its executing reverse. So i have foreign key constraints at child table , its giving foreign contraints error while running ssis package

Can any one tell me,
How to define my own sequence execution at the Data flow task (Source - Destination) ?

Thanks