You didn't happen to mention the age of your severe. I ask because the birds personality will likely change once it reaches three or fours years. That is an age many severes find themselves looking for a new home. My severe is somewhere between four and five. She is over bonded to me and as far as being my personal pet, she is excellent, smart, playful, extremely cuddly and snuggly. Although I initially found her somewhat rough to handle, I think some of that was testing me and later not knowing what my threshold of discomfort was. I handle her quite a lot, usually 2 1/2 hours per day on most days and more on weekends. She seldom bites me hard enough to bleed or cause real pain but likes to do this little pinching/drilling thing that's mildly painful. It's not the same as the "beak of correction" that she does when she disapproves of something I'm doing and sometimes her disapproval's can be absolutely indecipherable like her dislike of toilet paper to clean up accidents, (paper towels are fine) or what I choose for breakfast on a given day. She is bossy like that.
That's the way she is with me, to everyone else in the family she is perfectly hateful. She doesn't want me to speak with my wife and the more my grown son tries to win her friendship, the more aggressive she becomes towards him. Trying to win the bird over is counter productive and seems to only ramp up her methods of conveying that she wants nothing to do with the solicitor. She is nicer to strangers than she is to family members and what tolerance she shows is only because I immediately put her in a room alone if she makes any aggressive movement towards them. I'm pretty sure this is the same behavior that landed her on the sales floor. Her previous male owner, obviously distressed at selling her and the wife eager to close the deal at whatever price I was willing to pay. Although she seemed to immediately accept me as a friend (surprising), it was sad to see her cling to the side of her cage at a window facing a neighbors busy driveway, anxiously watching the comings and goings and become very vocal and animated when a man who physically resembled her previous owner came and went.
Every bird is different and I have read multiple accounts of people who say their severe is equally friendly with all family members. I don't think this is the most common outcome. I suspect that their birds may not have reached maturity. This appears to be really an issue with all the mini macaws and especially with the Severes. That's a shame because she is such a wonderful companion towards me but a source of friction for everyone else. I'm sure there are homes where this breed would fit in perfectly but the breed from what I have read and experienced is not a good choice for an all around family pet.
I hope your bird is not the one person bird these guys tend to be but I wouldn't allow a child to get within biting distance of mine. I warn all adults who attempt to charm her not to offer an extended finger or get angry when they get bitten. She seldom proves me in error.