How to make a Minecraft Profile without buying it again?

Okay so I'm trying to make a profile for my little cousin. I already have one with the bought game so to save money I let him download it from my profile. But then he wanted to play on servers and stuff so I was going to make home one. I did most of the steps like make a Mojang account, parents Permission, all that jazz. But then it said that to make it so I could use it I had to buy the game again. So I'm just kinda confused about it. Do I HAVE to buy it again? Is there some sort of loop hole?
Thanks for answering

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