Whitney only has a daughter, no son.
No. Angelica's relations are John (the director), Tony, Danny and Allegra. The actress Angelica's last name is Huston, not Houston.
No, while they have the same last name, they are not related.
If you are asking where she died, at the Beverly Hilton Hotel in California.
They may have the same last name which is Houston. But they are not related in any way, shape, or form.