Answer:
My grandmother, who lives in Virginia; my cousin, who lives in Milwaukee and my aunt, who lives in San Diego, are all flying here for my Bat Mitzvah.
Step-by-step explanation:
Resource Used: Grammarly
I copied and pasted the original sentence into Grammarly. The first suggestion it gave me was to fix the spelling of "flyin(g)." Once I did this, there was one premium suggestion. The premium suggestion said the punction in compound/complex sentence(s) was an issue. Specifically, they underlined the name Milwaukee and the semicolon next to it. As you can see, you can notice the adjustments that Grammarly approved.
I hope this helps you in any shape or form.