It must be prime time. Schedule some time every day just to talk to your child. And allow for some time each week to do something with each child that the child wants to do. Take time for your spouse. One of the things most likely to weaken a marriage is the inability to balance commitment to work with commitment to your marriage and to your spouse's needs.
People are too tired and worn out to give the effort needed to be a good partner.
Since choosing either work or intimacy is out of the question for those committed to their relationship, couples must learn to keep this tension creative and not destructive. Take time for the relationship. Do not make work an idol. If work is boring or tedious, it can drive a wedge between partners. Use high quality child care.