If txid is in the mempool, returns all in-mempool descendants.
txidstringREQUIREDverbosebooleanoptionalcurl --user myuser --data-binary '{"jsonrpc":"1.0","id":"1","method":"getmempooldescendants","params":["txid_here"]}' -H 'content-type:text/plain;' http://127.0.0.1:8332/[ "c104ecf24be...", "d1075db55d4..." ]