How early should you send wedding invitations?

I am not sending out save the date cards so I can save some money. Everyone on the invitation list is family. My wedding is on June 9th, and his family is on my case telling me I need to call everyone and personally invite them now so they can get off work. I think they are being a little overbearing and that if I send out invitations eight weeks prior, that will give them plenty of time to ask off. They say I am not being thoughtful and that out of town family members feel that they are not included in the guest list because I haven't contacted them yet. Who's right?