I agree with all comments so far. I'd also like to add that there is no reason they cannot have children together. Perhaps they cannot have those children in a 'traditional' sense of cis man impregnates cis woman but a family is not out of their reach. A biological child of one of them is not out of their reach. Adoption is not out of their reach though it would be a hard path. Seems letter writer is not seeing the whole picture. More important is if they even want kids. No person should have kids because their mother wants grand children. I've been there, called selfish, and it took my mum years to deal.