The questions I raised in my original post were meant to highlight points of confusion in the logline, you may know the answer to these in your head but they were not coming through in the logline.

Despite your efforts to answer my questions, the causal connection between the events is still vague. As a result of resurrecting their mother’s dead boyfriend they don’t NEED to keep the family secret, they would have had to do so anyhow with or without the zombie boyfriend. Sure it’s an obstacle of sorts, but one does not necessitate the other.
Further more, if they are truly scared for their lives, care about their family, the boyfriend was evil and dead then the logical move is to kill him instead of caring for him. They put all of themselves at risk – keeping him zombie alive just doesn’t make sense.

Your welcome to either take my advise on this or not, but series are best pitched with the pilot – you need a cracker of a pilot logline to catch a producer’s attention.

This concept mixes many known types of super natural beings, but that’s not working in my mind. Best to specify one type of super natural being the main characters will be, otherwise it feels more of a mish-mash of super natural stuff than a purpose driven family of characters.

Look at I-Zombie a good show that dealt with zombies, all the subplots and support cast came about as a result of the main character being a zombie. Buffy fought vampires and the later spin-offs fought demons, again we see that good series really focus on their character’s specifics and use them as the basis for the plots.

If you wish to keep the multitude of super natural types, then best to devise a premise that justifies a mix of super natural characters. In X-Men there were many characters with different super-powers, but not one particular power was the main focus of the series. In X-Men they made sure to devise a premise that justified, if not called for, all types of super powers under the sun.

Ultimately your writing about subject matter that is very trendy, which means it has a good chance of selling down the line. As it stands however, the flawed basic logic and lack of causality are working against the concept. Best to simplify – choose one main character, clearly define him or her and structure a plot around a single objective for them to achieve in the pilot. It’s the story in the pilot that will demonstrate what subsequent episodes will look like.