Getmempoolancestors

getmempoolancestors "txid" ( verbose )

If txid is in the mempool, returns all in-mempool ancestors.

Arguments:
1. txid       (string, required) The transaction id (must be in mempool)
2. verbose    (boolean, optional, default=false) True for a json object, false for array of transaction ids

Result (for verbose = false):
[           (json array)
  "hex",    (string) The transaction id of an in-mempool ancestor transaction
  ...
]

Result (for verbose = true):
{}    (empty JSON object)

Examples:
> bitcoin-cli getmempoolancestors "mytxid"
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getmempoolancestors", "params": ["mytxid"]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/