Did you just literally split the string in two? that is a bad idea, if this was an electrum seed, then the person would only need to crack 64bits to gain access. This is very easy to do, the Bitcoin network can crack a 64bit key in just 1 minute 40 seconds. Be careful! both your bank and your wife have full access to your funds.
Problem is they will also give it to a crooked DEA agent with a warrant. Also there can be legal issues when it comes to accessing vaults, it is quite common, it could mean that your family will have to battle it out in court for a number of years to access the vault. It's a pretty good solution, but not good enough IMO.