Teen's powerful duet with her brother who has Down syndrome is sure to move you

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Even though we don’t know her personally, we can tell that Leah Kirwan is a sweet, loving big sister.

Don’t believe us?

The duet she uploaded to her Facebook page of her and her little brother singing "Titanium" by David Guetta and Sia is proof enough. Leah's little brother has Down syndrome; "Titanium" is his favorite song.