Yes, Redmi Y2 can support split screen.
Yes, Redmi Y2 does have the dual app support.
Yes, Redmi Y2 does have the OTG support.
No. None of the Xiaomi phones comes with the earphone. You have to purchase it separately.
The Xiaomi Redmi Y2 is a slightly better attempt at a selfie-focused smartphone than the model it replaces. It has proven hardware that is capable of delivering a smooth user experience, plus MIUI 9.5 which has a lot of added features.