Restaurants are quite happy for individuals to pay separately to settle a group bill. My friends and family do this frequently. No need to work out how much we owe either, we tell the waiter what we have eaten/drunk and he works it out. Then we leave a group tip at the table.
Your SIL's behaviour will change once she realises you are not a push over, Catlover. Speaking up for the first time is the hard part, subsequently it becomes easier.
To think that London, or anywhere else for that matter, does not belong to any one demographic
Should women have equal pay and opportunities?
Nicola Sturgeon’s husband Peter Murrell re-arrested over SNP finances.