So we have 3 PS4's in the house (My husband, child 1 & child 2) They all have their own PSN Plus accounts. Instead of buying 3 PSN plus 12 month subscriptions can I get a family subscription that will cover them all?
No, you will have to buy separate subscriptions for each account. There is no "family pass".*
*You could game share, however. I'm not going to persuade or dissuade you from it, as it has its pros and cons. See Nitro.de's comment on your question (his answer to another question) on how that works, as it is a separate issue from what you're asking.