Just like everybody's response to the above matter, those are your options. But here's another one to consider if you want to try.
"Hi Mom, Dad. I want to let you know that I'm doing well in earning a living. I am a SALES PERSON for a company that I'm working at."
*Grab a friend for this to work with you. If your parents aren't convinced, tell them to call your friend who pretends to be your boss. Have him say a few good word about you, stuff like that.
*If they're still not convinced, they might be asking about where you're working from, tell them this:
"Uh, they hired me after I asked a few friends to help me get a job. Their main HQ office is in another district (like Mumbai or New Delhi or something but make sure that its really super far in India). They call me on my phone (if you have one) for any sales job assignment like handing out flyers all over <insert name of your area here>, and grabbing sales leads. I earn really big commissions here, Mom."
*Turn to her. Moms are usually very supportive.
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The bottomline, you are not really bullshitting here. The truth is, you are an Internet Marketer. That's a modern term for a SALES PERSON. So basically, this is a gray lie. I hope you get the point.
God speed.