Earlier quoted context omitted.
It’s unclear if the parent post meant that they have two contacts named “Mom and Dad” or if they are two separate contacts appropriately named.
It might be unclear for an A.I. But a human being can use their "theory of mind" and rule out any implausible interpretations of what a fellow human being means when they complain Siri is texting Dad, not Mom, when they say text Mom.
Yes, I work on that a lot, kinda. It’s tricky, like learning to move one’s ears the first time. When my spouse first brought it up I thought it was “theory of mine” and I kept expecting a name for what it is.