Peacefully May 21, 2019 at Groves Hospital, Fergus at the age of 79. Allen was born in Owen Sound to the late John Gilbert Castle & Elizabeth Eva Castle Wallace (nee King). He was predeceased by his first wife Marjorie Jean (nee McDowell) of Milton, brother Wally of Tobermory, stepfather Del Wallace of Georgetown. Allen leaves behind his wife Kathleen Blanch Howatt Castle (nee Millen), son’s Glenn (Donna), Terry (Maureen) & grandson Allen. As well, a niece Beth (Phillip) & nephews Bruce, Brian (Ingrid), Jim (Barb), a step-son Blair (Julie) & step-grandsons Peter & Glen. Cremation has taken place & interment will be at Evergreen Cemetery in Milton. Messages and condolences may be left at www.tricitycremations.com or 519-772-1237.