回複：H1轉 F1,When to File? Help Pls

you can file after your parents arrived. It doesn't hurt anything if your status is changed during their stay, as long as you have enough money to support them.
BTW, the processing time for H1 to F1 takes a long time. Check your state processing time.

https://egov.immigration.gov/cris/jsps/ptimes.jsp;jsessionid=d0AJF56sHkGf