He gave Hassan a plastic surgery to fix his harelip.
Baba shocks Amir by letting Hassan and Ali stay at the house, as Amir had put the wristwatch and Afghani bills under Hassan's mattress so that when Baba did find out about Hassan's stealing (a trait that Baba once told Amir he would never forgive in a person), Baba would want to push them out. Instead of Baba kicking them out, he forgave Hassan for "stealing" (he only admits stealing from Amir to protect him), and begs them to stay. Hassan and Ali leave the next morning and Baba weeps when they leave.
He remembers that Baba never forgot Hassan's birthday and that on one of Hassan's birthdays, Baba paid to have Hassan's harelip surgically fixed. Amir recalls when he asked Baba if they could get new servants, Baba had gotten furious and yelled at Amir. He had said Hassan and Ali are part of their family and they are not going anywhere. He also remembers that when Hassan and Ali left, Baba wept and wept.
Baba fixes Hassan's lip in Chapter 14 of "The Kite Runner." It happens after Hassan's assault by Assef, where Baba notices Hassan’s injuries and takes him to a doctor for treatment before fixing his lip himself.
if he had not seen him come out of his wifes womb himself
In "The Kite Runner" by Khaled Hosseini, Baba does not sleep with Sanaubar. Sanaubar is actually the mother of Hassan, Baba's servant and Amir's half-brother. There is a strained relationship between Baba and Sanaubar due to her abandoning Hassan when he was young.
Baba cried.
Baba sold his car to pay for Hassan's lip surgery in "The Kite Runner."
Ali and his son Hassan left Baba's household in "The Kite Runner" because they were forced to leave due to the dishonor of Hassan's biological father, which created tension and conflict in the household. Amir frames Hassan for theft to get rid of him, leading to Ali and Hassan's departure as a result of the betrayal and injustice they faced.
Hassan is revealed to be Baba's son, making him Amir's half-brother. Baba had an affair with Hassan's mother, resulting in Hassan's birth. This revelation adds a new layer to the complex relationships in "The Kite Runner."
well i don't know three.. but i know one seeing as I've only had to read till chapter 5 so far but 1. when Baba tells amir to ask hassan to go with them to the lake..Amir says Hassan cant but in reality amir didnt want hassan to go because of the last time when hassan skipped a rock 2 times more than amir and baba praised him for that and amir didnt like that.
Rahim Khan tells Amir that Hassan is his half-brother and that they share the same father, Baba. He also informs Amir about the terrible events that occurred to Hassan and his wife, and asks him to come back to Afghanistan to help rescue Hassan's son, Sohrab.
Hassan is Amir's half brother. Hassan's father, Ali, was like a brother to Baba so he lived with Baba. However, Baba impreganated Ali's wife and had Hassan who became good friends with Amir.