Ah ofcourse child pays for parent essentially always works. If I recall correctly replace-by-fee requires wallet support perhaps even at the time of creating th

Ah ofcourse child pays for parent essentially always works. If I recall correctly replace-by-fee requires wallet support perhaps even at the time of creating the original transaction. But child pays for parent is just universal because it doesn't need to replace the transaction in the mempool, it just pays the miners to move it out of the mempool.