In early 1912, the family travelled to England to buy horses, and so that Hudson could attend a director's meeting of the British Canadian Lumber Association. While abroad, the Allisons had their baby baptized at Epworth church.
The Allison family boarded the Titanic in Southampton. Hudson had booked 2 outside cabins with ensuite facilities. Hudson, Bess & Lorraine occupied one suite while Bess' maid, Sarah Daniels occupied the other with Trevor and his nurse Ms. Alice Cleaver. Two other servants, a cook Mildred Brown & chauffeur George Swane travelled in second class.
On the night of Apr. 14, after the ship hit the iceberg, Sarah Daniels decided that something was wrong, and went out by herself to investigate. She encountered several crew members who directed her to lifeboat 8 and assured her that "it was just a precautionary measure", wherein she boarded the lifeboat, which was then lowered from the ship. Alice Cleaver had taken Trevor from the cabin and never bothered to tell Mrs. Allison where she was going. She had Trevor carefully wrapped in a fur blanket, and they got into lifeboat 11, with crewman William Faulkner, who held the baby while Alice got in.
For the rest of the night, the Allisons searched the decks in vain for their son and Miss Cleaver. Not knowing if her baby had left the ship, Bess refused to be seperated form her husband and likewise her little girl, Loraine. The family remained together and died when the ship went down.
The next day, Alice Cleaver and Sarah Daniels realized that they along with Trevor, were the only survivors of their party. Upon the arrival of the rescue ship Carpathia, in New York, Alice was proclaimed a hero by the news media for rescuing Trevor, but was condemned by the families of both Bess & Hudson for abandoning the family to die.
While the bodies of Bess & Lorraine would never be found, the recovery vessel, MacKay-Bennett, was able to identify body No.135 as that of Hudson. The clothes and effects recovered were a leather coat, blue suit, grey silk muffler, keys, letters, photos, stock book, 3 pocket diaries, 1 C.P. Railway ticket book, 2 pocket books, card case, $143 in notes, chain with insurance medals, 15 pounds in gold, $100 Thomas Cook & Sons travellers cheque, 35 pounds in notes, gold cuff-links, diamond solitaire ring, gold stud, knife, silver tie-clip, $4.40 in odd coins and travellers ticket.
Hudson's body was returned home and buried in Maple Ridge Cemetery near Chesterville. There followed a well-attended memorial service at the Chesterville Music Hall where many friends and business associates paid tribute to both his character and his accomplishments.

Hudson Trevor Allison was born in Westmount, Montréal, Quebec, Canada on 07 May 1911. After the sinking of the Titanic, baby Trevor returned home to Canada, where he would be raised by his aunt and uncle, George and Lillian Allison.
Trevor died on 7 August 1929 at the age of 18 in Maine, USA of ptomaine poisoning and was buried beside his father in Chesterville, Ontario.