My Response:

I think you owe it to your son to be true to yourself. 

You will be giving him a much greater gift by teaching him by your example to find and follow his own purpose. 

Also, don’t sell yourself short because you think your new career won’t bring you enough extra income to compensate for the university tuition. 

There is no reason that it can’t. 

If you stay where you are just for the sake of his future tuition, you will feel disengaged from your life purpose, and rarely do positive effects in life follow from that choice.

Love,

Deepak