With the router that you have, YES, probably is preventing you to connect remotely, but the problem could be at your brother's end too, maybe the settings for the Slingbox on the router were wiped out for some power outage/failure, so check this at your bother's network, then test it out from your parents again, if it work it should work on your network too, if not then you will know for sure is a firewall problem.
Viper


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