How do you talk to a loose cannon?

[Lithium89]

Im talking about a family member. It's like every day is an argument. Im obligated to care for my family but its sort of love hate. There is bad blood but what makes it worse is there is no way to have a constructive conversation without it turning into a screaming match. For example anytime you bring up anything they always take it personal "oh thats right im a F*** up all I ever do is F*** up everything" even if you say nothing even similar to that. Its rough because besides being a loose cannon they blame me for everything going wrong. Someone else messes something up and its "Oh what did you do now?" we're both adults so how can you deal with someone who has such a bad attitude? Someone you talk to in confidence and then as soon as they get angry use your private feelings as fuel towards an argument... Im tired of fighting over every minute issue. I hate to say it but im much happier when im not near them. its like they have negative energy seeping from their very pores. how can you constructively talk to this kind of person ? or do you just get out while you still can?