The offspring who follow the footsteps of their parents in faith will be joined with them in Paradise even though the deeds of the former might not deserve that high rank!

However, no one will be punished for the deeds of others!

Verse 21 of Chapter 52

Those who have believed and their offspring also have followed in their footsteps in degrees of faith, We shall join to them those of their offspring also (in Paradise) and shall not deprive them of anything of their deeds. Every person is a pledge for what he has earned.