What does daughter in heart mean on an obituary?

"Daughter in heart" is a phrase that is sometimes used in obituaries to describe someone who was not biologically related to the deceased, but who was considered a daughter by them. This could be a stepdaughter, a foster daughter, or a close friend who was like a daughter to the deceased. The phrase "daughter in heart" is a way of expressing the close bond that existed between the two individuals, and of acknowledging the important role that the "daughter" played in the deceased's life.