I actually had a similar situation. As a college student being off for the summer, there's a growing pressure from the parents to find a summer job. With the economy on a downturn and me with little marketable skills, I cannot bring myself to work in fast food.
When asked once again about what I intended to do for a summer job, I told them coming June 18th, I would be the GM of a club of my choosing in OOTP. This would be my summer job.
"You're going to play a baseball game for nearly 3 months?" I could tell at this point they weren't amused. Of course, I told them with my fantasy drafting skills, it could take a good 4-5 seasons before I'm ready to compete for a playoff run. The parents, armed with sarcasm, then asked me how much this would pay towards my college education.
"It really just depends how much the owner offers me," I explained. "Sometimes there just isn't a whole lot of budget room after free agency."
The conversation abruptly ended there and I was forced to clean the basement for a good few hours
The moral of the story is...just tell your parents you have a summer job, invest in a decent laptop, and go out to the park every day from 10-5ish and play OOTP. Come back sweaty, demotivated, and tired, and they'll never suspect....mwahaha.