Recommend BitKey wallet.

BitKey uses a password and some security question to encrypt wallet data.
The password hint and security question will give the family member a good hint to decrypt wallet.

Besides the above design,  BitKey supports multisig-timelock address which is perfect to storage Bitcoins without worry about lost and stolen.

APP:
https://itunes.apple.com/us/app/bitkey-bitcoin-wallet/id898643317?mt=8

TimeLock-Multisig Address
https://medium.com/bitkey-blog/bitkey-s-multisig-timelock-address-22ff41c1b017?source=collection_home---6------0---------------------