Anne and her brother use 1 gram + 1 gram = <<1+1=2>>2 grams.
Anne's dad uses 3 grams and Anne's mom uses 2 grams so together they use 2 grams + 3 grams + 2 grams = <<3+2+2=7>>7 grams/wash
Each day, the family uses 7 grams/wash * 3 washes/day = <<7*3=21>>21 grams.
Using that amount daily, the toothpaste will last 105 grams / 21 grams/day = <<105/21=5>>5 days.
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