Haapalah

Felix Birnbaum and his family arrived in Montreal, and rented a flat next to the Rosen family (years later, Hymie Rosen became a pharmacist, like Dave, Joe and Stanley Birnbaum, and opened a pharmacy on Queen Mary Road, near Hampstead), the only people knew in Montreal.
No one has been able to tell whether they knew or knew of the Rosen family from Galicia, or from contacts they had made during their voyage to Montreald .
The family, who also knew the Rosens, moved in next door, and two of the boys, Morrie and Lou Richman (Lou later changed the family name to Richmond), who had come to Montreal from Kyiv, went to school with David and Joe Birnbaum.

Felix Birnbaum, with his wife, Hinda Kleiner, and their seven children sailed from Danzig/Gdańsk to Montreal.

As a young boy, Davey Birnbaum played the violin.

He contracted polio, and although he recovered and lived with the resiual effects, a heart murmer and clubbing of his fingers (Franklin Roosevelt suffered from clubbing in the fingers of his right hand.
The condition refers to the shape of the fingernails and the most distal part of the finger itself.
It is usually associated with a chronic disease, such as lung disease, or liver disease, and may be seen in heart failure, but is more classically associated with cyanotic heart disease).

David Birnbaum studied Pharmacy at Universite de Montreal, but did did not earn his degree, as he had to go to work to provide money for the family.
Years later, the university granted him a certificate, signifying his successful studies in Phamacy.

David and Joe Birnbaum bought a pharmacy and called it 'Birn's Pharmacy', on Villeneuve Street (east of Park Avenue).
They purchased a second pharmacy, on Bernard Avenue, at the corner of Querbes, in Outremont. They sold the pharmacy on Villeneuve Street, corner of Querbes (the building is still there, and it is still a pharmacy, 'Shore's Pharmacy').
The brothers opened a "Birn's Pharmacy" on Graham Boulevard at the corner of Rockland (across from what, at that time, were the Seven-Up bottling plant and Laniel Amusement).

David Birnbaum developed Parkinson's disease in his latter years, although the condition limited certain activities, he was able to enjoy most of his usual activities, with few restrictions.
He was put on medication for several years, which reduced the trembling, but age, and the condition began to tire him. His mobility became limited.
He suffered a heart attack, and was taken to Saint Mary's Hospital, where he was put in Cardiac ICU for several days. He spent weeks in the hospital, and died of heart failure.