John D. Grennen Obituary

We are sad to announce that, on February 24, 2026 we had to say goodbye to John D. Grennen (Spotswood, New Jersey). You can send your sympathy in the guestbook provided and share it with the family.

He was predeceased by: his parents, Darlene Grennen and William J Grennen Deacon; his uncles, David L Grennen, Joseph Grennen and Jimmy Grennen; and his son-in-law Tom Pearson.

He is survived by: his wife Mary Ann Grennen of Spotswood; his children, John Patrick Grennen (Kayla) of Milford, NJ, Kevin Grennen (Emily) of Sayreville, NJ and Jessica Pearson of Sayreville, NJ; his sisters, Joy Jensen and Holly Griffith; and his grandchildren, LJ, Jackson and Jordan. He is also survived by his nieces and nephews as well as great nieces and great nephews and his grand dogs, cats, and horse.

In lieu of flowers, the family requests making donations in John's name to NJ Sharing Network.