Before Applejack left Hope Hollow, she encountered a stallion who’s light blue. Not only he has the same job as her brother’s, but he’s also have the same face and body. His name is Cottonflock. She was curious on his daily life since she never meet his family or sister. The fact she saw him just like his brother except his body’s color is different, gave her an idea once she return to Sweet Apple Acres. The following day after the Rainbow Festival, Applejack brings his brother Big Mac to Hope Hollow to have him meet Cottonflock face to face.

Thanks to Daniyel099 for editing this.
https://www.fimfiction.net/user/292246/Daniyel099