John and Gloria continue their discussion of Bitcoin's mempool by explaining parent, child, ancestor and descendant transactions.

0:00 - Parent and child transactions

2:23 - Relevance of ancestors and descendants to the mempool

4:17 - Reasons transactions leave the mempool

6:58 - Miner's block construction considerations

11:46 - Full node performance considerations

16:15 - Child pays for parent and missing inputs

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