Dad gave Olaf 10 toy cars,
Mom has given Olaf 5 more toy cars than Dad, so 10 + 5 = <<10+5=15>>15 toy cars
Auntie gave Olaf 6 toy cars,
Uncle has given 1 less toy than Auntie, so 6 - 1 = <<6-1=5>>5 toy cars
Grandpa gave Olaf 2 * 5 = <<2*5=10>>10 toy cars.
All the family together gave Olaf 10 +15 + 6 + 5 + 10 = <<10+15+6+5+10=46>>46.
Adding the cars Olaf already had, Olaf's collection has 150 + 46 = <<150+46=196>>196 cars.
#### 196