I am from the South originally and now live and am getting married in New England where my FH is from. I've always known for the groom's family to pay for the rehearsal dinner but I am not sure if this is a regional thing or not.
I would never request that my future in-laws pay for the dinner, but I am just wondering if this is something they might offer to pay for or not. We got engaged three weeks ago and are having a pretty short engagement so I am on the planning track now. My dad and I are paying for the wedding, FWIW.