If you have older field guns, you may find that if they are fixed chokes they are likely "full" choke. If you have removable chokes, all the better. You will find that the close in targets that skeet shooting presents, is most suitable for a more open choke. If your trying to get your family interested in the shooting sports, skeet might also be a bit more daunting, if they aren't breaking targets. The rules are a little different, and perhaps more complicated (until you have done it a few times).
On the otherhand "trap" shooting, can and is done with a full choke barrelled gun. Beginners may break more targets overall, with a more open choke here as well, such as Improved mod, which can help get them "excited" about shooting. Most newbie shooters find that the target tends to get out a ways, before they shoot, so the tighter chokes can sometimes help break a few more downrange birds. Trap rules are simple, and quick to learn as well.
If this is the first venture out with the family to shoot targets, I would try to get them to shoot a discipline that they have the highest odds of breaking targets. If they see a few break, it's easy to keep them encouraged. Lot's of misses tend to discourage newbies, espcially if they are already a little nervous around guns.
My other advice, would be to let them shoot lighter loads. 1oz, 2-3/4 dram loads will give less kick, and still break targets.!
If you were to buy a new gun, not that you need to, I would get a Beretta AL391 semi-auto, Optima, (or Eureka). This light recoiling gun, will also be good for introducing "double" target shooting, which in my mind is the real fun.
JMHO's
