HW02: Family wealth management

Problem statement

Implement a smart contract for shared wealth management for families.

• The contract should store the addresses of two parents and one child.
• The contract should store the funds of the family in ether.
• Only the parents and the child can access the funds.
• There is a limit for single withdraws. This limit is 1 ether for the parents and 0.1 ether for the child.

Example scenario

Alice and Bob create a contract with 10 ether initial balance, giving access to their daughter, Claire. Every time they receive their salary, they transfer it to the contract.

Every time they need money, these three members of the family can withdraw money from the contract, knowing that Alice and Bob can only withdraw 1 ether, while Claire can only withdraw 0.1 ether at a time.

Contract interface

• constructor: function WealthManager(address parent2, address child) payable

  • The creator of the contract (msg.sender) is the first parent.
  • parent2 is the second parent.
  • child is the child.

• withdraw: function withdraw(uint256 amount)

  • Sends amount wei to the sender of the transaction.
  • Succeeds only if the sender is one of the parents or the child, and amount does not exceed the associated withdraw limit.

• fallback: function () payable

  • Receives ether from any address.

Contract skeleton

pragma solidity ^0.4.21;

contract WealthManager {

    // <contract_variables>

    // </contract_variables>

    function WealthManager(address parent2, address child) public payable {
        // TODO
    }

    function withdraw(uint256 amount) public {
        // TODO
    }

    function () public payable {
        // TODO
    }

}