We have 2kids in home, one is 1.6years and other is 2.2years old. Both are cousins. Elder one doesn't like playing with elders or kids, likes watching tv/mobile, doesn't respond when called or even shouted, talks 1 or 2 words. While younger is completely opposite, wants to play whole day, she doesn't rest, sleeps night 9-10hours night n 2hours daytime, talks non stop, hearing is too quick. Are both kids normal as per their age?