Headset Microphones for two wearers - how to?

[SianG]

Hi Everyone, I hope you can help - I'm a hypnotherapist who uses backing music and 2 sets of headset microphones for me and my client to wear. I have been using a soundboard with 2 wired sets of headsets, which allows me to talk over the backing music.
I'm sure there must be a way to do this with a pair of wireless headset microphones and the ipad?

Thanks!
Sian