You can alter the behavior of content assist by going to Window > Preferences > Java > Editor > Content Assist. The setting 'Hide proposals not visible in the invocation context' will determine which members are 'suggested'.
How this behaves is also determined by the access modifier of the member (private, protected, public).
For example with private members in the super class:
public class Animal {
private int legs = 0;
private int arms = 0;
}
The following is available when with content assist (ctrl+space):
Using protected :
public class Animal {
protected int legs = 0;
protected int arms = 0;
}