Yes they output to the same console, so you should get:
I am the child
I am the father
I am the child
I am the father
I am the child
I am the father
I am the child
I am the father
...
But you can also have something like:
I am the father
I am the child
I am the child
I am the child
I am the father
I am the father
...
The order is highly dependent on the operating system, the number of cores of the machine, and will probably be quite random.