DSS 15 goes to school a 30 min drive from our house (close to his mum's). He comes to ours on a Tues evening and then for some time over the weekend. It's an arrangement that's been in place for years and generally works well.
Current arrangement is that he walks home from school (30 min walk) and I pick up from his mum's around 4pm (due to time of day and an ever increasing volume of traffic we often get back home around 5.10) and then I take him back on a Wednesday morning before school (and work for me).
Is it unreasonable for DSS to get the bus halfway on a Tuesday and I then pick up from the midpoint. Saving time for us all. DSS is fine with this arrangement, as is his dad and me, his stepmum. His mum is not ok with this and does not want it to happen as it is a change of arrangements and is worried DSS will be too tired.