Can just the married father sign over temp guardianship to the grandmother if the mother and father are suppurated?

In general, a married father can sign over temporary guardianship to the grandmother, but the specific legal requirements can vary by state. If the parents are separated, the father's authority to do so may depend on the custody arrangements in place. It's advisable to consult with a family law attorney to ensure that the proper legal procedures are followed and that the mother's rights are also considered.