My husband was adopted. He would like to do Temple work for his adoptive parents, but they also had biological children. If the biological children are still alive, does my husband need their permission to do the Temple work?
There is no difference between adopted or biological family in FamilySearch. You always want to take other's feelings into consideration when performing ordinances.
There is a Knowledge Article that can help answer that question. You can look it up yourself in the Help Center by using the search term, "Individuals for whom I can request temple ordinances." It is not allowing me to post the link here. It says:
"You are responsible to submit names of the individuals below:
You can also submit the names of the individuals below: