Because Mommy Works (1994)

Since her divorce nurse Abbey lives alone with her 6 years old son Willie. Her ex-husband Ted may have Willie every second weekend. But when Ted marries Clare, who has two children herself, he wants to see Willie more and more often. At first Abbey welcomes this, because it leaves her time for her career. But when she sees that Willie suffers from the situation and wants to reduce the time Willie spends with Ted's family, he decides that he wants care and custody - and goes to court. His chances to win are good. Based on an authentic case.