In our first house one couple, who had no phone, used to turn up unannounced despite coming quite a distance.
We liked them alright but when I was going into labour with DS#2 and saw them approaching I groaned!
DH, ever hospitable, invited them for tea and we made a big spag bol. I was amazed that they didn't go home but then labour began in earnest. Baby#1 was asleep and it began to snow. DH called the midwife who told DH to drive me to the hospital. We told the couple that they had to babysit while he drove me and in fact they stayed the night.
Set them to work is my advice!
It works every time.