Also, disobeying your mom is probably not a good idea. Maybe you could try showing your parents the forum! Show them all the pictures of people's healthy, happy bettas on here, and all the great information on proper care!
My Current bettas:
Sullivan- Orange rose tail halfmoon male
Daisy- Mustard Gas (black and yellow) veil tail female
Milton- Teal butterfly halfmoon male (mom's betta)
DFTBA to nerdfighters working to decrease world suck!