Let daughter's current age be D
Then mother's currently: 2D
Father's currently: 2D + 5
Then, we have: D + 2D + 2D + 5 = 100
5D + 5 = 100
5D = 95
D, or daughter's current age =, or
Mother's current age: 2(19), or, or
Father's current age: 2(19) + 5, or 38 + 5, or