Visited an old mate and his family last month. Noticed their new personalised slate plaque by the front door.
Was quite possibly ordered @
Personalised Natural Slate Stick Family House Name Or Number Door Sign Plaque | eBay, since it's this type they went with, apostrophe positioned in this exact manner ...
View attachment 1060911
I think it's wrong whichever way you view it
- if just a plural form, not required
- if a possessive noun for the family regarding their home, as both the definite article and image indicate, then should have been placed at the end