1- (a) I don't want to hurt any living entity but still it happens ?what should I do?
(b) Every morning when you begin your day, you must repeat this five times: "I do not wish to hurt a single living being through my mind, my speech, or my body." You will lighten the burden of your responsibility because in reality you only have control over your intent.
You should every day make a very sincere and strong intent, with the same internal focus as one has while counting money say it with same concentration and say it loud.
2- (a) I can only see fault of others in family, This is pinching.
Dadashri: For example if you hurt Chandulal, then you have to invoke the one who is free from, thoughts, speech, and actions; bhav karma, dravya karma, and no karma; of 'Chandulal' (or the name of the person you hurt) and all illusions attached to that name. This One is the 'Shuddhatma Bhagwan' (the pure Soul). Then say, "Dear Shuddhatma Bhagwan, I have spoken in a harsh manner and that is a fault of mine. I am repenting for this mistake. I am asking for your forgiveness. I am resolving not to repeat this mistake. Please give me the strength not to repeat the mistake again." Think of Dada (The fully enlightened Lord within The Gnani Purush) or Shuddhatma Bhagwan when you do your pratikraman. First do alochana, or confession of your mistake. Then do pratikraman, which is the actual asking of forgiveness that will cleanse your mistakes, and lastly do pratyakhyan, which is your resolve never to repeat the mistake.
(b) "When you begin to see everyone in your family as faultless, then you will know that your pratikraman is true. People definitely are faultless; the whole world is faultless. You are bound by your own mistakes, not by theirs."
(c) When you understand this, you will be able to resolve everything.