Yes, your children can qualify you to file as head of household as long as they lived with you for more than half the year and you meet all of the other requirements. In order for your exspouse to file as head of household, he would have to qualify with dependents who are NOT these same children and he would have to meet all of the other requirements. Please refer to the following FAQ to learn more about head of household filing requirements. https://ttlc.intuit.com/replies/3288637
