Since we're the DGPs, it just seems natural to have the extended family with us. Out of 8 specific periods of DVC vacations this year only 2 have DH and I exclusively using the points, the other 6 are with groups.
We usually take DD, DSIL, 3 DGC with us but always plan at least one trip for just DH & me. On occasion we have taken sister and her family and have arranged for 2 of her sons and their families to use our DVC. It is great to be able to share.