If you're in that same situation where one of you has an iPhone and the other has an Android, then this cable is exactly what you need to minimise the amount of different cables you have knocking round the house. It's especially convenient in the car so you don't have a spaghetti fiasco in the glove box!

Currently selling at £6.99, it's a bargain 

USB To USB C Adapter, USB C to USB C Cable, Multi Charger Cable,4 in 1 iPhone Charger Cable, USB C to Lightning Adapter