Why do mothers marry off their sons if she wont allow him to accept the wife emotionally?

because they want 2 c ther sons a dutyful man and along wid it they also wants her son 2 love and be wid him more than his wife..she demands more suppot against the wife 4 mere pamperment and as a own property...... they cant c ther sons loving sumbdy els more than her blood.thats it! its a psychology..wen u wil hav ur children u wil also feel so psychologically....