Bathroom code-separate lines for receptacles and lights.What if old bathroom's inline

[Cadewest]

I am adding a bathroom on the third floor at my house when I finish the attic into a master suite. I'm adding/remodeling a bathroom on the first floor. I am hoping to get my house up to electric code. This, I plan a dedicated line for bathroom lights (15 amp on 14 gauge) and for bathroom receptacles (20 amp with 12 gauge).
However, the main is that I want to hook in my already finished bathroom on the second floor to these two circuits as well. However, the electric is run up first to a gfci then inline into two side vanity lights. This is all on 12 gauge. Which of the two circuits could I hook it in to??

also, if I am placing my washer and dryer in the first floor bathroom, how does that affect the codes stating that laundry rooms and bathroom receptacles each have to have heir own dedicated circuits. What do I do if it is one room with 3/4 bath and laundry?
Thanks much!

 

[augie47]

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