I would say the worst is neglect. A parent can be poor and yet still take a child for a walk or talk with them. Some parents just feed and clothe a child and the parent thinks that's enough. It isn't. Children are human beings. They need attention to feel like someone is interested in them. You don't have to have a car or even much money to have a close relationship with a child. If there is a brook nearby, take them fishing. Teach them how to bait the hook. Small accomplishments for a child is a big thing. A home made tent in the summertime in the back yard even made with sheets, is fun for kids if they have a friend to be there with them. Kids should learn how to cook simple things around the age of 12. Hot dogs, toast, eggs. I did that with my grandson, took him fishing, went for walks. They like to feel good about themselves, and whenever they learn how to do something new, it is important to let them know you are proud of them. Neglect is selfishness. It is a mind-set of parents who want to do what they want to do and put their kids on the back burner.