Just been chatting to DP about something and we can both see the argument for both options, so I'm interested to know how you'd all think about this!
DSS (17) has a sports competition overseas next month. DP is going with him, so he's booking flights, an Airbnb, and a hire car.
DSS's friend has also qualified. His mum can't go, so DP has said he can travel with them. They'll all be in one Airbnb, with 2 bedrooms and a sofa bed which DP would have booked whether the friend was coming or not.
Would you split the shared costs half and half, or have the friend's mum pay for a third?