What rules do you have for traffic between your lans? There wouldn't normally be NATs between your lan segments.
If this uses multicast then you might have to use the IGMP proxy - from that other thread which seems to be the same as what your trying to do
http://doc.pfsense.org/index.php/IGMP_ProxyNow that was back from jan 2010, and seems last post says there is problem with igmp proxy in 2.0 ??
I personally have not use/need of it so have never tested it.
Might be easier if you just ran one segment

Is there some security reason in a home network? why you want/need 2 lan segments?