Here is what Elder Paisios has to say,
Both the father and mother will be responsible for not looking after their children and taking care about their future. Not only is it not considered a sin if both of them work to earn more money in order to be able to pay for their children's studies, or build a house for their daughter, but it is their duty to do so. The parents, who do not look after their children, are not good parents and they will have to justify their actions to God. Sin is to earn money out of self-interest and not to have trust in God's providence.The important question to ask is what is the reason that both parents work. It is out of self-interest, prestige, or the attraction of a luxury way of living, or is it out of a need to care for their children. Caring for our children is an essential responsibility in the eyes of God.
Reference: Elder Paisios of the Holy Mountain, p 124