Dereliction is a word for neglecting responsibilities. Failing to care for your family or do your job are examples of dereliction. Someone can be fired for dereliction of duty, meaning they have failed to do their job.
Thats correct
For example when u want to add the word
Family ---> families
Baby ------> babies
If it ended with y preceded by a vowel sound then u dont change y to i
Boy ------> boys
Toy -----> toys
Etc.
Relationships is the answer I believe
I hope this helps!