This joke is a pretty good punchline but you would need more setup. Mom working at a sex change clinic is a good start but you need a reason to make the pun make sense in both senses.
Was it called Expert Sex Change?
What?
Sue me - change me into Susan
I guess.
It would’ve been funnier if a trans woman whose chosen name was Susan said that before going for the sex change. Or, I guess, more specifically, went to get her name legally changed to Susan. Elsewise it just sounds like OP was a big Johnny Cash fan.
Oh
Sex exchange?
Expert ones, no less.
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