v 0.5.14d windows 10
If someone is pregnant and then aborts or loses the baby, it will still appear in the relations screen ( as a daughter that will never be born).
I tried "updating" by going to the next day, same result.
The entry in "see relatives" appears as soon as the mother is pregnant, not at birth. And if the child dies before birth, the entry stays.
Edit : If a slave dies in battle, she also stays in the relatives screen. Not sure if intended or not. Tested with starting slave = sister.