Trying to get a phone to replace my brother's Samsung Galaxy Nexus:

Brand : Any Android brand
Spec : Not too much bloatware
Budget : 500 (can over a bit)
Size : 4" -ish

Also, getting first smartphone for parents:

Brand : Any Android brand
Spec : Not too much bloatware, simple UI, for whatsapp/browsing
Budget : 500 (can over a bit)
Size : 4" -ish

1. Brand. (Preferably Asus but open to suggestions.)
2. Budget. (700 max)
3. What you need in the phone.
My lil bro wants a new android phone. Plays light gaming (candy crush etc.) and internet browsing. Size is hopefully not bigger than 5".

Thanks.