Again I maintain, and I will always continue to maintain, that this is irrelevant. We are NOT talking about a kidnapping by someone unknown to the children.
What you seem to forget is that children are bonded to the mother from before birth, so it is natural for them to want to stay with their mother. Its called maternal bonding, and it begins to develop during pregnancy. Many things stimulate the development of the bond, and these include mother beginning to feel her unborn child moving. On the other side of the bond, the unborn child hears the mother's voice and heartbeat. By the beginning the third trimester, maternal bond can be very strong.
The desire to remain with an unknown captor is called the Stockholm Syndrome. Absolutely NONE of the things I have mentioned above take place. The bond formed in a case of Stockholm syndrome is based on violence, fear and distrust. The captor is usually physically violent toward the captive, and then when the violence stops, the captive mistakes this for kindness. This seems counter intuitive but it comes about as a result of the victim's subconscious need to survive in traumatic circumstances.
To suggest that a child's bond with it mother's and a hostage's bond with a kidnapper are the same is preposterous in the extreme. They are not analogues of each other in any way, shape or form.