Anatomy ultrasound?

Im a young parent and still live with my mother. She's very involved with my pregnancy and extremely supportive. However, my SO is too. We all live together. My mom wants to be there for every ultrasound and appointment. My SO wasnt there for the first ultrasound because we didn't know it was scheduled till we went to the appointment. Now, I have my anatomy ultrasound where we'll be finding out the gender and im only allowed to have one person in there with me. I personally want my SO since it is our baby and its a moment I want to share with him but she very much so wants to be in there. Who should I pick??

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