Although Alexa Brown meets the minimum requirements for a separate article, I believe that WP:N's lead is relevant here: "Editors may use their discretion to merge or group two or more related topics into a single article" is highly relevant.  Creating separate pages for these tightly related subjects both causes editorial hassles (trying to keep the two pages in sync and needing to decide whether a piece of information belongs on one page or the other) and reduces the likelihood that a reader will get the whole story (because most people will only read one of them).  Also, keeping it all here may reduce the temptation to use the biography for (self-)promotion of the politically active parents and/or their organization.  IMO merging/not splitting is the better answer.