Hi, My Boyfriends Son Passed Away At The Age Of

Hi,
My boyfriends son passed away at the age of 6 from leukaemia. My question is that if I had a child with my boyfriend what are the chances that our baby would develope Leukaemia because his other son had it, even though they would have different genes from myself and my boyfriends genes?
Thanks so much, any help
Would be great!