Well, it was bound to happen: someone's created the abraham tag. So do we go through all 116 avot-patriarch-fathers questions now, splitting them up into abraham, isaac, and jacob, and retaining it only for questions about all three? Or do we split it up and not keep it at all (questions about all three can have three tags)? Or do we merge abraham into avot-patriarch-fathers? Or what? Please post suggestions as answers. This question makes no specific suggestion.
I think we should create isaac and jacob tags and split up the avot-patriarch-fathers questions into the three other tags, so people who wish to find questions about (say) Abraham can do so without sifting through questions about the others.
Only a question that's about the threesome as a threesome (not about the three individuals) should retain the avot-patriarch-fathers tag, and only if there are enough of them to make such a tag worthwhile (more than three, perhaps). If the avot-patriarch-fathers is retained, its tag wiki should clarify that it should not be used for questions about specific patriarchs.