Parent was asking a question, "is this not tantamount to x?" With the expected answer being "no, this is not not tantamount to x" which reduces to "yes, this is

Parent was asking a question, "is this not tantamount to x?" With the expected answer being "no, this is not not tantamount to x" which reduces to "yes, this is tantamount to x." In this case, the intended answer/conclusion/implication is "yes, this is."