Explanation:

Guru Ramdas was the fourth master in Sikhism and known as the founder of ‘Amritsar’ city. He was born on 24 September 1534 in a poor Hindu family based in Lahore, part of what is now Pakistan. His birth name was Jetha, he was orphaned at age 7, and thereafter grew up with his maternal grandmother in a village.
At age 12, Bhai Jetha and his grandmother moved to Goindval, where they met Guru Amar Das. The boy thereafter accepted Guru Amar Das as his mentor and served him. The daughter of Guru Amar Das got married to Bhai Jetha, and he thus became part of Guru Amar Das's family. As with the first two Gurus of Sikhism, Guru Amar Das instead of choosing his own sons, chose Bhai Jetha as his successor and renamed him as Ram Das or "servant or slave of god