The kids might take about 2Ah out of their batteries each run. You might take 3Ah out of yours (this is a bit of a guess as I run 2wd buggy and TC, but I'd be surprised if its more than that).
Total Ah will be:
5 x 2 (kid 1) +
5 x 2 (kid 2) +
5 x 3 (SC) +
5 x 3 (4wd)
= 50Ah at about 8.4V = 420 Watt Hours (50x8.4).
a 100Ah 12v battery = 1200 Watt Hours (100x12). Although you can never get all of that out, and it's generally best to stay above 50% charge as the battery life will be much longer, so I'd safely estimate 600Wh for regular usage.
The charger won't be 100% efficient; it converts some energy to heat, and runs a fan/display etc, but even so you're well within the limits of the battery.
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