Is it filial piety or stupidity for a man who has never married to serve his old mother

Tweet

There is such an old lady with two sons. The eldest son married and had a son. She lived with the younger son. When the younger son reached the age of marriage, the old lady was dissatisfied with every blind date. After a long time, the younger son gave up. He promised the old lady that he would not marry and have a son in this life, and that he would serve the old mother wholeheartedly. Later, when he was old, he took over from the elder brother's family A son