What are the family rates? Do these passes entitle you to go to the front of lines?
No on both questions. No family rates and these are just annual passes no special rights.
They offer a free “fastpass” to all ticketholders on select rides, which allows them to bypass the regular line. However, they only allot so many for the day, and when they’re gone, they’re gone. All other parks I have visited charge you for the “jump the line” pass. Most other parks also offer periodic discounts - like bring in a coke can, or get a coupon at your local fastfood restaurant. Disney does not do that.
Yes, they do...eventually.