Is it bad for me to practice two different sports?

I'm 15, and I love practicing basketball, I practice it regularly and don't inted to stop. But, I really wanna start practicing volleyball as well...my mom won't let me cus she says it's bad for me and that I should focus on only one sport, but I think I could handle it. (I'd practice basketball... show more I'm 15, and I love practicing basketball, I practice it regularly and don't inted to stop. But, I really wanna start practicing volleyball as well...my mom won't let me cus she says it's bad for me and that I should focus on only one sport, but I think I could handle it. (I'd practice basketball for 2-3 days a week and volleyball twice a week)
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