Answer: stepdad

AnswerCrossword Clue
STEPDADAcquired family member
STEPDADJohnny Cash, to Carlene Carter
STEPDADCyrus Rose vis- -vis Blair Waldorf, on "Gossip Girl"
STEPDADMike Brady, to the girls
STEPDADAcquired pop
STEPDADEdward Murdstone, to David Copperfield
STEPDADPop from a different line
STEPDADNew old man?
STEPDADMike Brady of "The Brady Bunch," e.g.
STEPDADMember of a blended family
STEPDADMike, to Marcia, Jan, and Cindy
STEPDADBlended family member
STEPDADBlended-family member
STEPDADJay Pritchett, to Manny, on "Modern Family"
STEPDADNew pop?
STEPDADOnassis, to JFK, Jr.
STEPDADMike Brady, to Carol's girls
STEPDADBlended-family parent
STEPDADNew parent, maybe