Will my atheist family go to heaven or hell?

I'm 13 and converted to christianity recently. I don't want my family to go to hell. I want to know what allows you to be saved.

My parents and grandma believe in a Heaven, Hell, and God, but are skeptical about Jesus. My father, mother, and grandma believe that Jesus lived at one point, but are unsure about his Crucifixion and Resurrection. Should I keep praying for them? Should I keep preaching the word of God to them? My family grew up in china during the Mao Zedong years so it may be harder to accept jesus.