No individual is capable of blindly loving their parents, brothers and sisters in the same way that they blindly love their own children.
The reason for this is simple: human beings do not carry out gene preservation via their parents, brothers and sisters. This is only possible via their own children.
Hence we reach the conclusion that blood is not always thicker than water! There can simply be any degree of affection for one’s parents, brothers and sisters (from a huge amount to none at all) which is developed via parenting and cohabitation over a long period of time.
The reason for the development of amicable relationships between brothers and sisters is also simple: it is a way for parents to maximise gene preservation. The closer children are when growing up, the greater the chance that they will preserve their own genes, and, by consequence, the genes of their parents. This is why the majority of parents try to create a warm atmosphere in the family, fostering friendship and mutual support between their children.
Despite expectations built on myth and literature, when children grow up living in separate homes, adult meetings between brothers and sisters are often unsuccessful. The same goes for meetings between biological parents and children brought up in children’s homes. There is a reason for the Kazakh saying that goes: ‘I didn’t see you being born, and I won’t cry when you die’.
In the majority of cases, the love that a person feels for their own children is ‘blind’ and limitless because it is based on gene preservation. This is why parents can love their children their entire lives without getting anything back, even if their children do not love them in return.
Alanbek Yussupov, based on “The Last Faith: a book by an atheist believer“