First of all, it is very important to know the background of potential partners, whether looking for a new partner after the death of a spouse or making friends at ordinary times. If your new partner has a criminal record or background, it may really affect your grandson's future. For example, some felons may not be able to work in certain fields, such as education or medical care, and may be deprived of custody in some cases. Therefore, I suggest you be honest with your new partner, figure out how to keep your grandson's future unaffected, and consult a lawyer or a professional if necessary.