Support for families or carers of people with severe depression

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I wondered if anyone knew of a support network specifically aimed at helping and supporting families and/carers of people with severe depression? Everything i have found is based around educating how to help or support the depressed person and while that is important, what I'm looking for is that safe place to vent, rant and rail, ask for other peoples experiences and general support for the people around the depressed person. Tia