The Ninth Circuit has determined that even in light of the Board of Immigration Appeals' decisions in Matter of M-E-V-G- and Matter of W-G-R-, a family still remains a quintessential particular social group in asylum law. The court acknowledged that persecutors are more likely to identify individual family members as part of a particular social group when familial ties are “linked to race, religion, or political affiliation," but to declined to hold that the family unit must be intertwined with another protected ground to be cognizable as a particular social group for asylum purposes.
The full text of Flores-Rios v. Lynch can be found here: http://cdn.ca9.uscourts.gov/datastore/opinions/2015/12/01/12-72551.pdf