Does a children's aid society investigation pause an ongoing family court parenting case?

Not automatically. A children's aid society investigation and the parents' own parenting dispute are separate proceedings under separate statutes, and opening one doesn't suspend the other by default - your family court case keeps moving through its normal steps unless a party specifically asks the court to pause it, or the judge decides on their own that a temporary delay makes sense so the investigation's outcome can inform the parenting decision.

Courts are generally reluctant to leave parenting time, decision-making, and support issues unresolved indefinitely just because an investigation exists, especially early on before anything has been substantiated - children still need a functioning schedule and clear arrangements while things get sorted out. A parent who wants a pause can bring a motion asking the court to adjourn a step pending the investigation's results, but the court will weigh the urgency of the parenting issues against the benefit of waiting. If the investigation results in an actual protection application, a temporary care and custody arrangement, or a wardship finding, that's a material development the family court will want to know about, and either parent can bring an updated motion once it happens.