Hi - and I am also sorry to hear of your situation.
So long as you and your wife can afford to continue to pay the joint contribution, there is no reason why the IVA's cannot continue - you just each pay your share of the monthly figure. I suspect that your wife may not wish to continue in this mannger, though, if she is required to pay more than you, so the IVA's can also be separated.
Take specific advice from your IP in this regard.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk