Proper motion analysis of WISPIT 1b and WISPIT 1c. Each epoch is marked with a unique marker shape: diamond (2022), circle (2023), and cross (2024). The coloured version of the marker indicates the measured position of the companion. The unfilled (black outline, white centre) version of this marker indicates the position that the companion would have been at at the corresponding date if it were a background object. The dashed curve depicts the parallactic track of a background object from first epoch to last epoch. The χ² between the measured positions and the background track is 78.2 for WISPIT 1b and 3.8 for WISPIT 1c.