If you actually have been served with papers, yes you should have your own attorney - and quickly. The first question is whether to file a motion to dismiss or an answer - and this has to be made with some speed.
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It is hard to answer your question without knowing the allegations against the others. However, you should make a pre-Answer motion to dismiss for failure to state a claim. I handle these type of cases.
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You should definitely have your own attorney. Even though all "defendants" might be united in interest in so far as wanting to defeat plaintiff's claim in its entirety, there is no such unity when it comes to the percetage each might be responsible to pay in the event liability is resolved in favor of the plaintiiff as against one or more of the named defendants. This presents a potential conflict of interest for the attorney who would represent all defendants. If you have your own homeowner's insurance report this claim against you to that carrier and you may be able to have that carrier pick up your defense and indemnity.