He married Dr. Santha Joseph (died 2023), retired as Additional Director, Kerala Health Department, on 15 September 1971. The couple has four children, three sons and one daughter, named as Er.Apu John Joseph, Dr. Anu Yamuna, Antony Joseph and the late Jomon Joseph.[4] Jomon Joseph, the youngest, suffered from Down's Syndrome, and died due to a massive heart attack in 2020 aged 34.
Joseph's first time as a Minister was in 1978 as Home Minister in A. K. Antony's ministry. He served this role for nearly 8 months. He resigned the position for his colleague K.M Mani.
As Revenue minister (1981-1987)
Since 1981 Joseph became Revenue minister in K. Karunakaran's ministry. Joseph was Revenue minister between 1981 and 1982 and 1982–1987.
As Education minister (1996-2001)
In E. K. Nayanar's ministry between (1996 and 2001) Joseph was Education minister. He was instrumental in delinking Pre Degree from Colleges and merged with School Education as +2.
PWD minister (2006-2010)
He was short-term PWD minister in V. S. Achuthanandan's ministry in 2006 and 2010. He resigned twice. The first time he was accused of misbehaviour with a lady co-passenger. He was acquitted by the court. The second time was for leaving Left Democratic Front for united Kerala congress. It was after 23 years, Joseph's party again merged with Kerala Congress (M) and an alliance member of United Democratic Front (UDF).
On 30 April 2010, Joseph resigned from the LDF government and declared his party's merger with K. M. Mani's party. After UDF's win in Kerala Legislative Assembly's election in 2011, Oommen Chandy became Chief Minister of Kerala. Joseph was appointed minister for the 7th time, now with the portfolio of irrigation; he completed his term in 2016.[15]
Chairman Of Kerala Congress
A power struggle erupted in the party between Jose K. Mani faction and P. J. Joseph fraction. The Election Commission intervened and it ruled in favor of Jose K Mani. Later, the faction led by P.J Joseph merged with Kerala Congress.
On 27 April an online meeting was convened by the party leadership in Thodupuzha and P.J Joseph was chosen as party chairman.[16]
Controversies
Joseph resigned from the Kerala Cabinet on 4 September 2006 as he was accused of misbehaviour with a lady co-passenger on a Kingfisher flight. He was acquitted by court on 11 May 2009 due to insufficient evidence.[17][18][19]