
Quoting
How remarriage affects survivors benefits
In general, you cannot receive survivors benefits if you remarry before the age of 60 unless the latter marriage ends, whether by death, divorce, or annulment.
If you remarry after age 60 (50 if disabled), you can still collect benefits on your former spouse’s record. When you reach age 62 or older, you may get retirement benefit on the record of your new spouse if they are higher. Your remarriage would have no effect on the benefits being paid to your children.