My brother is currently a freshmen in one of the California State University. He wants to transfer to a UC so he is thinking about transferring to Community College for sophomore year and then transfer to UC, maybe berkeley or davis. I was thinking if the fact that he transferred from CSU to CC is going to harm his transfer application to UC. Thank you for your time!!! 
Actually transferring from a CC is easier, since the transfer courses are easier to articulate through assist.org, plus if he has most of his units from a CC, then he will be given higher priority than from a CSU.
@Gumbymom he is already attending CSU and next year he is going to CC. Is it going to harm his application to UC.
No, it will not. Going from a CSU to a CC to a UC is an acceptable path. Depending upon which UC’s he is targeting, he can do TAG (transfer Guarantee) if the majority of his units are taken at the CC.