D.D.
Coming from a large family on both mine and my husbands side I have seen this situation many times. It is perfectly acceptable to introduce them separately by saying the father of the groom mr. .......... escorted by ....... and the mother of the groom Ms........ escorted by ........ The person escorting them in can be anyone from a son or daughter to a second husband or wife. It is all very common these days. Best of luck to you, don't let other people get you down or stressed. Enjoy this special time Its her Day!!!