The owner of the Palmer house says her name is Tremond. That's also the name of the old lady (and her grandson) from season 2. The same old lady used to call herself "Chalfont". In "FWWM", Harry Dean Stanton's character says that before the Chalfonts, another family named Chalfont lived in the trailer.
This could be a hint that the unseen husband is possibly Pierre (Miss Tremond/Chalfonts grandson).