There is no need to edit anything, parents are valid and competent witnesses for a marriage registration. 

Your parents being your immediate blood relatives should not be witnesses to your marriage 

2) approach registrar office for changing your list of witnesses 

The parents of either or both the parties to marriage can very well be a witness to the registration of marriage.

There's no legal infirmity in it.

You need not change it.

Just inform them to produce their identity proof.

Yes they can be witnesses for marriage registration

Parents are good witnesses for the marriage registration purposes, besides the priest who solemnized the marriage and two guests who attended it in person.

The most recommended witnesses are parents only apart from other witnesses. Let your father and mother sign as witnesses.

Yours parents can be witness to your marriage. There is no legal impediment.

As per law, anyone who is the holder of an Aadhaar card or PAN card or other acceptable proof as per the list of documents can be witness.

- However the witness should preferably not be an immediate blood relative and should have attended the marriage., but it is not mandatory .

- Hence, no need to edit the same. 

Dear client,  The witnesses are preferred to be the closest blood relation each from bride and bridegroom. Ideally they insist on one of the parents along with their identification and address proof being the witness to the registration. In your case. Since, your parents are the witness it is perfectly fine.