What was meant to be a joyful family reunion for a Kenyan family in the United States has taken a heartbreaking turn, after their beloved patriarch mysteriously vanished just hours after arriving.

Reuben Waithaka, 72, had travelled over 13,000 kilometres from Kenya to Alabama, filled with excitement and pride to witness his grandson graduate from high school - a milestone he did not want to miss.

According to CNN, he went to the US  bearing heartfelt gifts: old, treasured photos of his son as a young boy, and matching African print shirts for himself, his son, and his grandson - a symbolic gesture meant to unite three generations in one beautiful, memorable moment.

The reunion had been planned for months.