A trans man or trans woman biologically do not correspond to the gender they see themselves as. No matter what procedures a trans person goes through, a trans woman will not be able to produce ovules and a trans man will not be able to produce sperm.
A child being raised by two people of the same sex might think that is the norm at some point on their life. It is not like that and they might get confused. That does not mean that they will be a bad person or not. It is not directly related.
"Having two parents of the opposite sex is the norm." Is that what you are saying?