26.Turtle(海龜)mother has three sons.The first son is seven years old.The second one is five and the third is four. They often have a running game. They think they run fast. One day, the three sons decided to have some coffee.When they got into the café (咖啡館),it started to rain. The first turtle said to his brother,"Go home and get the umbrella." The little turtle answered,"I will, if you don't drink my coffee." "OK. We won't drink your coffee."The other two promised. Two years later, the first turtle said to the second turtle, "Well, I don't think our brother is coming back, so let's drink his coffee." Just then a voice(聲音)called from outside the door,"If you do that, I won't go."
根據(jù)短文內(nèi)容,回答下列問題. (1)How many sons does turtle mother have?