Well, tonight we go for a non-sequel, then a sequel to the non-sequel. Confused? Of course you are. Hollywood in the 1950s will do that to a person. The first film is from 1951, The Son of Dr. Jekyll. This film, which wasn’t really a sequel to the 1941 Spencer Tracy-starrer, asked the question nobody was probably pondering: what if Dr. Jekyll had spawned before getting killed?
Then following that is a true sequel, which is The Daughter of Dr. Jekyll, in which Gloria Talbott (I Married a Monster From Outer Space) is the titular character and may have gotten that “Jekyll Family Problem.” This was a double bill with The Cyclops, which also starred Talbott.