OnBind.java

public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

    if (holder.getItemViewType() == CHILD){
        TextView viewID = ((ChildViewHolder)holder).viewID;
        TextView parentID = ((ChildViewHolder)holder).parentID;
        TextView text = ((ChildViewHolder)holder).text;

        Friend friend = (Friend) general.get(position);
        viewID.setText(friend.getId());
        parentID.setText(friend.getParentID());
        text.setText(friend.getName());
    }
    else {
        TextView viewID = ((ParentViewHolder)holder).viewID;
        TextView personNameID = ((ParentViewHolder)holder).personNameID;

        Person person = (Person) general.get(position);
        viewID.setText(person.getId());
        personNameID.setText(person.getName());

    }
}