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Right now I want your important advice on how to convince them.
The only thing you can convince your parents to invest in Bitcoin is you should educate them, if you have enough knowledge about Bitcoin then you should teach them, you should explain to them what is Bitcoin and Also share them the experience of other investors in Bitcoin but not just achievements you should tell them that it is risky to invest in Bitcoin because of volatility but in the long-term one thing for sure you will get an profits if you stay focused and chill.
Yes, if the OP can properly explain what Bitcoin is to his parents, surely his parents will understand and be interested in investing in Bitcoin.
My parents didn't believe in Bitcoin they thought it was a gamble and at first they stopped me from investing in Bitcoin. But I gave my parents good idea about bitcoin and at some point my parents understood. Now my parents don't compare bitcoin to gambling. Actually most parents in our country are not educated so they don't understand Bitcoin easily.