Legal Question in Wills and Trusts in California

There are many questions that come to mind. For instance, who were the Settlors of the trust? Your Aunt or her brother. Were they married at the time the original trust was created? When and why did the aunt make the change to the trust? Was the Aunt have the legal capacity to make the change? Is your wife the daughter of the brother? What does "share in her part of the spouses trust" mean? And so on.

Assuming the change was legal, based on what you wrote, only the children, grandchildren, etc. of the brother living at the time of the brother's death would be entitled to an inheritance from his portion of the trust estate. The remaining portion would, I assume, be the brother's spouses portion and all of the children would be entitled to a co-equal portion of that amount.

This is complicated and I suggest your wife schedule an appointment with a Trust attorney to review the documents and map out how the estate should be distributed.