Re: Inlaws tagging along on honeymoon
Here is a serious answer with the help of wikipedia.
riginally “honeymoon” simply described the period just after the wedding when things are at their sweetest; it is assumed to wane in a month. The earliest term for this in English was hony moone, which was recorded as early as 1546
Yesterday I was watching Green Acres and Lisa says to Douglas " the honeymoon is over when husband stops opening the door for his wife ". He gave in to this ultimatum and opened the car door for her although the situation was very awkward for him to do so.