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Anyone can make an account at the Minecraft.net website.
No. Two people can not play on the same Minecraft account. You can buy it for some few dollars (the price changes now and then when new updates come) on Minecraft's home page. The link can be found under "Sources and related links" below this answer.
No.
Technically, anyone can download Minecraft for free from Minecraft's website; however, you can only play Minecraft if you purchase an account.
As long as the password and username are correct, you can access their account. Some of the time, other sites will only accept one internet source for their account to be accessed by (ex. facebook). But in this case, you can.