In terms of security purposes and safety of your Bitcoins, hardware wallet is the best, although it is very expressive to purchase but you really have to get it since it will be involving your wife and children ,that is, the number of Bitcoin to be stored will be in large quantity which is worth protecting .
The main purpose of a hardware wallet is to solely store Bitcoin, and it stores all your private keys on the device, which makes it easier for you when you connect it to the computer for transactions all signing takes place on the device and your private keys are never ever exposed to the Internet and is free from attacks that software is and others are vulnerable to