Anatomy scan tomorrow

My SO’s boss booked a last minute trip up to headquarters so he will be missing our appointment. I will have the tech write the gender in an envelope and we will open it together when he’s back tomorrow night. Anyways my grandmother who’s 90 just moved in with my mom. I offered to my mom if my grandmother would want to go since who knows how many more years she has left and it would be special for her. She doesn’t know yet what doctor appointment she will be escorting me too tomorrow so it will be a big surprise.