The five oldest children are still alive, and four of them died before they were fifty. Is it related to Feng Shui?

Everything is man-made, and Feng Shui is just a manifestation of karma. Think back, have you ever done anything that shames your conscience, or committed a murder in your life in despair. Or I have been stolen, cheated and humiliated many times in my life. Husband and wife are fate, children are karma, some come to pay debts, some come to collect debts. Leave as soon as the debt is paid, and leave as soon as the debt collection is satisfied. It's all cause and effect. If you want to change the cause and reverse the cause and effect, you should go to the temple to do things sincerely and clear the cause and effect. Without debt collection, there would be no feng shui.