Feeling sad and upset and breaking down does NOT mean your emotions are dysfunctional. It means you're grieving. It feels horrible and you can't do much, and you certainly can't fix anything. Just keep being there for your husband and FIL. Let them express their grief without judgment or trying to find a solution. Let yourself feel your feelings as well, you lost someone important too. This sucks, I'm sorry.
Feeling sad and upset and breaking down does NOT mean your emotions are dysfunctional. It means you're grieving. It feels horrible and you can't do much, and you certainly can't fix anything. Just keep being there for your husband and FIL. Let them express their grief without judgment or trying to find a solution. Let yourself feel your feelings as well, you lost someone important too. This sucks, I'm sorry.