I have my grandson old Iphone 5 and i needed to change the icloud to myself how can i do this
I cannot get my grandson old IPhone 5 to reset
You need to ask your grand son to use his Apple ID & password to logout of iCloud.
This is what he has to do before giving it to you, read link below:
What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support