Three choices, not one
Original language describes the production. A dub changes the spoken track. Subtitles provide written dialogue, while descriptive captions may also include sound cues. The selected viewing edition determines which combinations are available.
Before a family movie starts
Check the language menu together. A child may prefer spoken dialogue they understand while another viewer benefits from captions. Test a short scene so nobody has to interrupt the opening to find a setting.
Text that is too small or out of time
Use size, background or timing adjustments where the player supports them. If an entire subtitle track is offset, make sure it matches the film cut or episode. A different release can have different timing.
Visual storytelling
Flow has no spoken dialogue in its catalogue language field. Robot Dreams also places much of its storytelling in gesture, movement and sound. That can make an interesting change of pace, but always check the actual edition for accessibility options.