Genealogy / Looking for family ~ Dzyngl (Jingle) [4]

I live in Canada ~
My family name was changed from Dzyngl to Jingle when my grandfather came from Krakow, Poland with his brothers & sister. He was a carpenter in downtown Toronto. To my knowledge he was born in 1903 and died 1970. From what I understand my great grandmother was burnt to death while her children were hiding under the floor of the home in Poland. I was 6 when I found him on the couch, he had died in his sleep. I have tried to find information about this part of my ancestory but only my mother has told me what I know now. I don't know how to begin. I have 5 children and would like to be able to share valuable knowledge of my family history with them.

Thanks
Jingle