User blog comment:GotAnyMoreOfThem/Dipper and Mabel's parents./@comment-26486489-20150928080017/@comment-26072045-20150928122547

Alex isn't the type to lie. He's never actually lied. Toyed with his wording, yes but never lied. However he recently was asked if Dipper and Mabel's parents would appear and he refused to acknowledge it due to potential spoilers. It's possible he changed his mind.