Concur. The other relatively easy option would be the Saddle Trail. A couple of the trails up to Pamola Peak (Dudley and especially Helon Taylor) are also pretty straightforward, but if you insist on hitting the true summit you'd have to cross the Knife Edge from there, which won't happen if you discover that your charges suffer from vertigo.
Suppose I agree, too, if summit is the focus (and hey, sometimes it is).
My first time up was on the Saddle. I was with my brother, 6, and a family friend, 78. The advantage of the Saddle is that if your family is really just not into it that day, you have stops that are still "feel good" places: Basin Ponds, a marked (well, it was, probably still is) viewpoint, and of course, Chimney Pond. Both Hunt and Saddle hit the Tableland at about a mile from the summit. Wife and daughter could stop there while Dad summits, if that fits within the family dynamic that day. If coming from the Hunt, go just a bit further to Thoreau Spring on the Tableland.
The Hunt Trail does have Katahdin Falls at, what, 1.1 miles? but I like the landmarks on the Chimney Pond Trail (on the way to Saddle).
I think the difficulty of Abol tends to be a bit overstated; the exposure is minimal (no iron rungs needed) and it's a blocky/rubbly slide rather than a friction climb like Coe. It is, however, very persistently steep. Few people go down it (returning via Hunt instead) and descent can be fairly hard on the knees if you're in a hurry. But I wouldn't rule it out if the other trailheads are full.