We have seen some step siblings able to all get along fine but they seem to be the exception. More likely, one sibling feels divided loyalty to the birth parent, not the step-parent.
My sister, her husband and I own an S Corporation with 25%, 25% and 50% ownership, respectively. The S Corporation invests in rental properties. My brother-in-law passed away earlier this year, so does my sister get a step-up in basis for her husband’s portion?