Harbhajan Singh

1. Father: Sardar Sardev Singh Plaha

   "Born to a Sikh Ramgarhia family, Harbhajan is the only son of Sardar Sardev Singh Plaha, a freedom fighter who owned a ball bearing and valve factory."

2. Sister: five sisters

   "He grew up with five sisters."

3. Mentored by Erapalli Prasanna

   "In mid-2000 an opportunity arose when Harbhajan was selected to be in the first group of trainees sent to the National Cricket Academy to study under Erapalli Prasanna and Srinivas Venkataraghavan, two off-spin bowlers from the Indian spin quartet of the 1970s."

4. Mentored by Srinivas Venkataraghavan

   "In mid-2000 an opportunity arose when Harbhajan was selected to be in the first group of trainees sent to the National Cricket Academy to study under Erapalli Prasanna and Srinivas Venkataraghavan, two off-spin bowlers from the Indian spin quartet of the 1970s."

5. Coached by Charanjit Singh Bhullar

   "Harbhajan was trained as a batsman by his first coach, Charanjit Singh Bhullar, but converted to spin bowling after his coach's untimely death saw him under the tutelage of Davinder Arora."

6. Coached by Davinder Arora

   "Harbhajan was trained as a batsman by his first coach, Charanjit Singh Bhullar, but converted to spin bowling after his coach's untimely death saw him under the tutelage of Davinder Arora."

Source: Wikipedia, extracted via LLM.