Crikey, what is the world coming too - the person in concern is clearly the mother and quite rightly named as such in line with the recognised norms in current society from a biological sense.
However, if a person wants to identify differently outside of the constraints of a birth certificate (where perhaps the gender doesn't matter in terms of description from a biological front), then it's their call to do so.
But - changing it on a birth certificate would have been a step too far IMO.
This is one of the better takes here, 100% agree.