I signed my stepsons permission slip for a field trip, placed my check in an envelope for his mom to give to the school. She opened the envelope, saw my signature went to the school and got another permission slip and signed it saying I have no legal right to sign it?? I've signed plenty of planners for homework, papers at parent teacher conferences, all with my husband their father present. How am I in the wrong, all of these things have been on my husband's parenting time not the mothers. I've never interfered with anything on her time, only attending sports events and such for the kids when they fall on her days, so if I can be an emergency contact at the school why can't I sign a permission slip??