It's my brother in laws 40th in January and I've arranged (sis is a bit lame at arranging stuff, he's super introverted) for a meal at a country pub near us and then back to ours (we have a home pub in our garden) for a bit more drinking, pool etc. They have two teenage girls (still in education with small jobs). We don't often eat out, but previously we happily split the bill three ways, us, our folks and my sister paid three portions. What's changed is the girls no longer have children's meals and they both have an alcoholic drink or two. Should the bill be split three ways, or should we split the bill eight ways and my sisters puts in four payments? Being British I hate all this kinda stuff and do not like confrontation.