25
Those were the sons and grandsons who were born to Jacob and Bilhah. Laban had given Bilhah to his daughter Rachel. The total number of people in the family line of Jacob and Bilhah was seven.
26
The total number of those who went to Egypt with Jacob was 66. That number includes only his own children and grandchildren. It doesn't include his sons' wives or his grandsons' wives.