DH, my brother and I disagree on how petrol costs should be split between families. I will drip feed slightly as I think if I put the full history it will skew the answers a bit (nothing huge but just a slight omission) but I will post again after a few answers.
Scenario - 2 adults and a child from one family and 1 adult and a child from another family travelling in a car.
Option 1 - split 5 ways and charge per person
Option 2 - split 3 ways between the 3 adults
Option 3 - split in half, half each per family.
I am guessing no way is absolutely correct (and I totally get that it is a minor problem either way) but I would really appreciate your views. Thanks.