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contracts...CallingParentContracts.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;


contract A {
    event Log(string message);

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

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

contract B is A {
    function foo() public virtual override {
        emit Log("B.foo called");
        A.foo();
    }

    function bar() public virtual override {
        emit Log("B.bar called");
        super.bar();
    }
}

contract C is A {
    function foo() public virtual override {
        emit Log("C.foo called");
        A.foo();
    }

    function bar() public virtual override {
        emit Log("C.bar called");
        super.bar();
    }
}

contract D is B, C {
    function foo() public override(B, C) {
        super.foo();
    }

    function bar() public override(B, C) {
        super.bar();
    }
}