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Saponac should be a perfect spot for kids. There actually used to be a small contingency of locals that fished it off the white perch but I haven't been up that way in a decade plus. Easy access if the kiddos get cold, I think you will have fun.
Are you renting and AirBnB there? We rented one there last March. Nice camp, nice pond, good snowmobile trail access. We fished it hard for 3 days, used our fish finder and moved around a lot trying to find the white perch that we had heard about. Not one perch for us. You will get plenty of flags which is good for keeping the little ones busy. Unfortunately, it's mostly small pickerel. We did manage a few smallies, only one decent one though. Overall it was a nice trip but we are going to go somewhere else (Cambolasse Pond) this winter to try to find better fishing. Good luck, enjoy your trip, and let me know if you have any other questions. Andy
Here is the spots we fished in 2.5 days up there in order. First day was spots 1-3. It was all pickerel except for one smallmouth at spot 2 mid morning. Second day was spots 4-6. Spot 4 had a couple small smallmouth and more pickerel. Spot 5 was strictly pickerel. Spot 6 was the morning of the third day. A few pickerel there and one very respectable smallmouth. We fished there until 9:30am, packed our gear and headed home. All in all it was an ok trip but the fishing was not very good.