I have 12. Several sewing machines, including my Mom's White Family Rotary treadle, my first sewing machine,1 embroidery only,1 sewing/embroidery machine,3 sergers, a mechanical Brother sewing machine,and computerized Bernina,Pfaff,Brother. Every machine has it's own special thing it does better than the other. What hobby does your father enjoy? If it is woodworking, I bet he has more than one bit,one saw,etc.