Sealing

I have a friend that is asking this. She got sealed to her husband after he past and she is wondering if her children need to be sealed to them. They aren't interested and she wants to know if they do will it have to be after they are dead

If their mother wasn't sealed at the time of their birth, they'll have to be sealed in the temple. (General Handbook 38.4.2.1)

To be sealed while living, they'll have to be temple worthy.

You can read the policy in General Handbook 38.4.