Answer:
Passive
Explanation:
The passive form of writing a sentence structure, in which the subject receives the action, can be a good choice for being diplomatic in some contexts.
Definition
Active and passive voices are two forms of writing or describing a sentence. In active voice, the subject comes first and it states the action that is given by the verb in the sentence, whereas in the passive voice, the subject comes after the action of the verb.
Usage
Passive voive is usually used when addressing a public in general, to give a message not to an individual but is equally applicable to all and also acceptable to many. 
One other area where passive sentence structure is used when someone has to indicate preference in the person/object that encounters an action than the person performing that action
 
        
             
        
        
        
Hey! They can work hard to achieve the goal or do the action. Some people may
in this way if they are under great deals of stress. They may lash out
on people around them. By how they act to a subject.
        
             
        
        
        
Yes it’s good, though it’d be better if you used “Your sister and my sister are best friends, they do many things together” that (and) word doesn’t seem necessary. Hope this helped :)