New Delhi, May 25 -- Former US President Joe Biden appeared in public for the first time since revealing his prostate cancer diagnosis, attending the high school graduation of his grandson, Robert Hunter Biden II, on Friday.

The ceremony took place at the Salisbury School in Salisbury, Connecticut, and brought together several members of the Biden family.

Photos posted on Instagram by former First Lady Jill Biden and daughter Ashley Biden showed the 81-year-old standing proudly with family. Jill captioned one image: "Proud Nana and Pop! Congratulations Hunter - we are so proud of you."

Robert Hunter Biden II, the 18-year-old son of Hallie and the late Beau Biden, graduated in front of a cheering family. Beau Biden, the president's elde...