The whole group is saying we don't know what your parent's situation was with the title when she passed. We aren't sure about your addition and the wording used. We don't know how your siblings come into this and if they were on the house or mentioned somewhere legally. There are several ways to determine your basis depending on the facts.
@Anonymous_ did a great job and made a note guessing about your dad owning the property alone and an assumption for your addition.
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