Even though parents need a separate life for themselves, children need lots of attention and tender loving care. Spend regular quality time with each child. Hear what they're really saying, and spend fun time together. Don't wait until your child gets in trouble before you pull yourself away from your busy life to hear what they have to say. Answer their questions in a straightforward manner.
Kids have a way of finding things out.
Better for you and for your child, not to mention better for your long-term relationship, that you be up front with your child from the very beginning. Of course, care should be taken on how much you say, depending on the age and maturity of your child. Don't shelter them to the point of overshadowing and smothering a child's independent nature. Give them responsibilities early, and then expect them to keep up with them. Let a child have a life outside of you and home, with friends and other families with whom they can relate.