When the Other Parent Stops Assuming Alternate Custody

Case Background

I recently consulted with a father whose divorce I finalized a few years ago. The divorce agreement established alternate (50/50) custody for his two children, now of school age: one week on, one week off with each parent, and half of school holidays.

For some time now, the reality has diverged completely from this agreed arrangement. Due to frequent professional business travel, the mother no longer assumes her alternating custody weeks. As a result, the father in practice cares for the children three weeks out of four, sometimes more, as well as the vast majority of holidays.

What the Client Expected

His query was straightforward: Could the court legally compel the mother to resume her agreed share of custody? This imbalance not only weighs heavily on his daily routine, but also hinders his professional career. He had structured his own work-related travel during weeks when the children were with their mother; he can no longer do so, and now struggles to manage expectations with his employer.

What Cannot Be Legally Obtained

I had to be completely honest with him: French law provides no mechanism to force a parent to physically take their children. If a parent refuses or fails to assume their designated week, the court cannot compel physical custody, and leaving children unattended is obviously out of the question. As long as the situation persists, the father is obliged to step in during the mother's absences.

The Legal Leverage of Child Support Reassessment

However, there remains a tangible and effective legal lever. Until now, under the alternating custody regime, the father received a modest child support contribution. Yet he now assumes the children's daily care far more frequently: this fundamental shift in the actual division of parental care justifies petitioning the Family Affairs Judge for a substantial re-evaluation of child support, even if both parents' income levels have remained identical since the divorce. It is not parental revenue that has changed, but the actual proportion of parenting time dedicated to the children.

This legal approach serves a dual strategic purpose. The prospect of formal judicial proceedings may incentivize the mother to resume her custody weeks. And if she does not, the increased child support will provide the father with financial resources to fund childcare-such as a nanny or babysitter-during the extra weeks he assumes, mitigating the penalty to his professional career.

Key Legal Takeaway

You cannot legally force a parent to exercise custody. But the law is far from powerless: when one parent assumes care far beyond what the divorce agreement stipulated, the financial contribution to child maintenance can be recalculated accordingly. While the court process takes time, it restores balance-or, failing that, provides the financial means to cope.