Of course. Parents have divorced, no longer have any legal relationship, but the son is like two people, and now his son is getting married, which is a major event in his life. As a mother, he should be present to congratulate his son, but if his son's mother is present, his biological mother will not grow up, so treat him as a guest and sit at the guest table. This is respect for the son's current mother. Of course, if the son doesn't want his mother to be there, or the mother doesn't want to embarrass everyone, for fear of bad influence, he can also choose not to attend the wedding, but the blessing can still be sent out, and he can send red envelopes to his son and daughter-in-law.