Do you agree with me all languages belong to one language ? Is it right?

Definitely yes, as all humans belong to one couple only , it is the same with Languages, the Hieroglyphic language is the oldest known written language all over the world and it does have so many words silmilar to the Arabic words  ex.  MESEH is a crocodile in Hiero. its TEMSEH in Arabic etc.   

Yes , I agree that all languages belong to a one language. Imagine if an Arabic ,  Chinees, Russian and a French live together in an isolated island, would you think they won't understand  or communicate with each other? Absolutly NO. Because even thought they speak different languages, they have a common language which is  simply  the body language. Moreover, if the same persons are listening together to a sad music , all of them will be influenced by the sad melodies, so you won't see one of them laughing  and the other crying. They will have all the same feelings because music is their common language.  as Besides , the fact of being silent while listening to music can be considered as a common language .

No, I don't agree.

Arabic, Persian and Urdu are written from right to left; English, French, German and many other languages are written from left to right; and Chinese and Japanese are written in columns.

Languages may have similarities in certain aspects, such as Arabic, Persian, Pashtu and Urdu have some common words. They may have same or slightly different meanings in these languages.

yes, as we know we all belong to Adam (he was the1st human on the earth). in that time he used one lang