In a family of four, the father uses 5 bath towels per week, the mother uses 3 bath towels per week, and their two children use 2 bath towels each per week. If the washing machine can fit 4 bath towels for one load of laundry, how many loads of laundry will the family need to do each week to clean all of their used towels? Let's think step by step and output the final answer within \boxed{}.
user