I am a newbie here. Here is a question. If a Catholic has a relative that dies and the immediate family of the deceased arranges a funeral at a protestant church, may the Catholic attend such a service in any circuмstances? 

I did run a couple of searches here at Cathinfo trying to dig up dialog on this topic, but I did not find any. I probably just need to better learn how to search.  Can anyone link me to material that will give me insights? I have been told that Catholics are absolutely forbidden to participate in any protestant service. Can anyone shed more light on this?

Thank you in advance.