NJ tax question on sale of house co-owned with parent

[Chris L.]

When my father died I inherited 25% of my fathers portion of my parents property at step up (mom disclaimed this portion) and my other brother inherited 25% at step ups as well (mom disclaimed this portion as well). The property is in an LLC and owned 50%mom and 25% me and 25% my brother. Mom resides in the house on the property, me and my brother do not reside there. We do not charge mom rent to reside there. We don't plan on selling the property until mom passes because her house is on the property. My question is this, Im assuming that moms portion of the property will be increased to full step up when she passes and that part of the property will be inherited by all of Moms 5 children; however, what will happen with my and my brothers portion of the property and will we be able to take 250k deduction each for capital gains? Are there any strategies to reduce capital gains taxes on my and my brothers lots?

Thank you