Jacob Israel Siskin died peacefully at home in Vestal NY on May 25th, 2021, in the loving care of his grandson Scott Siskin. Jack, as he was known to friends and family, was born August 3rd, 1933, to Geraldine and Paul Siskin. He was an Army Veteran, a beloved pharmacist and patriarch of the Siskin family. He was predeceased by his parents, his brother Seth and his wife of nearly 50 years, Estelle ( Esther) Siskin. Jack served his community as a pharmacist caring for many with his knowledge and smiles. Lovingly known as “Papa J”, he relished in his grandchildren, teaching them to ride bikes, play gin rummy and poker - asserting a well rounded education. He attended every concert, event and milestone. He is survived by his brother Stewart (Gail) Siskin and sister in-law Joy Siskin; three children Jodi (Kenny) Volmert, Craig (Laura) Siskin and Barry Siskin; seven grandchildren Aryeal Jackson, Scott Siskin, Katie (Ethan) Mazzarella, Sam Siskin, Ashley Volmert, Olivia (Jim) Reiman, and Duncan Siskin; his five great grandchildren Luca and Atlas Jackson, Piper and Paige Reiman and Maisie Mazzarella. He was a founding member of Beth David Synagogue. In lieu of flowers, donations in his honor can be made to Beth David Synagogue, 39 Riverside Drive, Binghamton, NY 13905. Funeral services will be held on Friday May 28, 2021 One o'clock at the DeMunn Funeral Home, 36 Conklin Avenue Binghamton, NY with Rabbi Zev Silber officiating. Funeral services will be on the DeMunn Funeral Home Facebook page starting at 12:50 o'clock. Interment will follow services in Beth David Cemetery in Conklin Road, Conklin NY. Family will receive friends for Shiva from 1:00 til 6:00 pm, Friday, May 28, 2021 until Friday June 4, 2021 at 812 Dickinson Drive, Vestal, NY 13850. To forward condolences please visit www.demunn.com. Arrangements for the family are directed by the DeMunn Funeral Home.