Mother's Day proved to be an emotional affair for Robin Roberts as she took the occasion to remember her own late mother.MORE: GMA's Robin Roberts says she's 'so grateful' as she makes career announcementThe Good Morning America anchor took to social media to share a heartbreaking family anecdote on the occasion that involved her sister Sally-Ann Roberts.VIDEO: Robin Roberts breaks down crying in rare comments about her childhoodShe posted on Instagram that her sister had shared a Mother's Day prayer in honor of their own mom, Lucimarian Roberts, who passed away in 2012."My dear sister @sallyann_roberts shared this prayer with our family this morning," Robin wrote. "Thinking of our beloved momma cheering us on from her Heavenly balcony.