Sukkah 46: When the Children Ate Their Etrogim

On establishing the halakhot of certain blessings, specifically on the mitzvah of sukkah - which brachot does one make, and when? And what about the brachot for many mitzvot that come to your hand at the same time? Which raise considerations of how the mitzvah of sukkah differs from the mitzvah of Jordanian. Also, on the minhag of children of finding the etrogim, and eating them. And other uses of sukkah materials, in terms of waiting to midday, or not. Note: if the children could use those etrogim, why not also the adults (the usual curiosity seems not to prevail here, though really anyone could use them). The sukkah is set aside for use until sundown at the end of the 7th day, but the expectation is that lulav/etrog will have finished being used earlier... What links these mitzvot?