These two ladies died within hours of each other but under strange circumstance

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I don't know the full relation of these two. I know that they are either sisters or mother and daughter but as for how they are related to me? I don't know. I know they are atleast Great x 3 whatever relation they are to me. A doctor was called to the house after the owner found one lady dead. I don't know if the doctor ever left or not but the other lady was found around three to four hours later. The signature on the death certificate is supposed to be from the same doctor but the latter signature is very shaky. One certifiate claims "natural causes with tuberculosis as a factor" but I don't remember what the other one said. We (The family) thinks it's strange because the doctor's handwriting appears to be shaky only a few hours after signing the first certificate. Of course there are a number of reasons this could be, but who knows? I don't remember everything that was on the certificate and these were relatives that were born before my great great grandfather for sure. This was also information we gathered via ancestry.com whereas the first I told of was word of mouth.