how to talk about phallo with my family?

I'm unsure how to talk about phallo with my family? How has everyone done this?

My family are supportive of my transition (been out for over 11 years now!) Called correct pronouns ect.

I rely on family to help me get to gender appointments as well as surgery appointments. I felt comfortable taking to them mostly with regards to when I had top surgery as I was so excited for that! Same with my hysterectomy.

But with phallo, I don't know where to start. Shall i just refer to it as 'bottom surgery' I just feel uncomfortable saying they're making my penis.

I'm definitely looking forward to phallo but it just feels like it's much more personal and private surgery then what I've had in the past....