Hi Bill,
A believe the issue is related with the Multicast support of your router, it is essential to support mulitple packets to use AirPrint.
The following discussion regarding the IGMP Snooping option of your router may help resolving the issue:
https://discussions.apple.com/message/22131110#22131110
I would also ensure that the iOS devices are connected to the 2.4GHz wireless network, the printer does not support 5GHz connection and both of the devices should be connected to the wireless brodcast of the same spectrum.
Hope that helps,
Shlomi