Tension

One person was driving ,on the way he saw one beautiful lady is asking for lift, so he took her in the car, after some time he found she is not feeling well so he took her to the doctor,doctor said she is pregnent, when it is asked to lady whose bady is this, she shown to the person who took her to the doctor,this one type of tension, latter doctor checked the person and decleared that this person cannot be a father, this  creats double tension, Later he started thinking that which put him in extrem tension that the two children who are there in his house are whose.