How can I treat the type of a subclass's member as it's own type rather than it's parent type in Java?

Question

I have this class

class Node {
    Node parent;
    int rank;

    public Node() {
        this.parent = this;
        this.rank = 0;
    }
}

I would like to create subclasses of Node, but I want parent to be the same type as it's corresponding type.

How can I do this?

Ultimately, I am trying to create a special UnionFind data structure. I implemented the find and merge functions for the data structures. However, I want to extend this and add more functionality. I would like to add the member V value to Node and record the minimum value of each set. For me, the best way to do this is to create a subclass of Node. Would there be a better way to this?