CallingParentFunctions.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

/*
calling parent functions 
- direct 
- super 

    E
  /   \
 F     G
  \   /
    H
*/

contract E {
    event Log(string message);

    function foo() public virtual {
        emit Log("E.foo");
    }

    function bar() public virtual {
        emit Log("E.bar");
    }
}

contract F is E {
    function foo() public virtual override {
        emit Log("F.foo");
        // direct method
        E.foo();
    }

    function bar() public virtual override {
        emit Log("F.bar");
        // using keyword "super"
        super.bar();
    }
}

contract G is E {
    function foo() public virtual override {
        emit Log("G.foo");
        // direct method
        E.foo();
    }

    function bar() public virtual override {
        emit Log("G.bar");
        // using keyword "super"
        super.bar();
    }
}

contract H is F, G {
    function foo() public override(F, G) {
        F.foo();
    }

    function bar() public override(F, G) {
        // "super" calls the function "bar()" in all the parents of the Contract H
        super.bar();
    }
}