My neighbors are in a fight with their brother over splitting the cost of a baby sitter. Couple one has 2 kids. Couple two has 1 kid. The baby sitter charges $12 an hour for 1-2 kids and $15 an hour for 3 kids. At the end of the night couple two offered up just $3 per hour of money and couple one said no we should split it 50/50. At the moment it has been two weeks since that night and they have not spoken since couple two grabbed their kid and left in a huff after ultimately agreeing to pay $7.50 an hour. My neighbor asked me what I thought. I agreed that it was only fair to split the cost 50/50. If they had each got a baby sitter they would each be out $12 an hour. There are certain fixed costs for the baby sitter and those costs should be split 50/50.