I'm a good singer, but my sis claims she's better. I KNOW i'm better. What can I do? Please help!!!

Just ignore her. I know it's hard, (trust me, I grew up in a house of 7 kids) but sometimes it's what আপনি gotta do. As long as আপনি have confidence in yourself, that's really all that matters.

But, if you're serious about proving who's better, আপনি could have a contest. Each of আপনি sing to a randomly selected friend/relative and let them decide. Or, if আপনি don't like গান গাওয়া in front of people আপনি could record yourselves.

There is really nothing আপনি can do if someone is being immature in that way. Ignore her. আপনি have nothing to prove.

Do a গান গাওয়া contest to know which one's better. অথবা record both of your voices গান গাওয়া and judge which one's better.

have a গান গাওয়া duel challenge her have your বন্ধু and family choose

Just say "You know what! That is super mean whether I am a good singer অথবা not! How would আপনি like it if I called আপনি a bad singer অথবা ব্যক্ত আপনি sing of key?"

Have a contest, and let who eva is watching decide! prove yo sis wrong and প্রদর্শনী off yo talents!!!!

Don't fret! No offence, but it's just a voice! It doesn't matter who's better, what matters is that you're both awesome in your own unique way!