Help for my Mom in Selling her Home and Partnering on a New Place

[Brad Shearer]

Looking for some advice BP Family. My mother, 85 years old, would like to sell her home and move in with my wife and myself. She would like to sell the home and use the proceeds to help us purchase a slightly larger home for the three of us to share. However, she's concerned about two things.

1. The tax impact of selling the home. If we both sell our current homes and pool the proceeds for another home jointly owned, will we both face tax penalties or no? 

2. When she passes away (say five years from now), how would my siblings (brother and sister) get a share of the proceeds of the sale of her home (which have now been bundled into the home jointly purchased)? 

Is there a better way to do this that prevents a tax hit to her (she would make far more than $250K on the gain) and provides a fair share of the inheritance to my siblings while still allowing us to take in my mom in a new home (our current home has too many stairs to accommodate her)? 

Thanks for any help or insight you can provide.