Note: I am saying family member instead of just sibling or parent or any other word. Because you never know, parents can be good, but siblings can be the worst people on the earth, meanwhile, siblings are likeable, but parents are abusers.
Possibly controversial.

It's perfectly okay to hate a family member or family members. This "related by blood" nonsense excuses nothing and justifies nothing. Some people use the "i'm related to you" etc excuse to abuse or disturb a family member, (usually older on younger, but sometimes, there are some younger family members who irritate older family members, age does not matter, anyone can be a jerk) and sometimes, older family members like to use their age as an excuse (talked about this on the #225 post) to control a younger family member and say rude things to them. And sometimes, some family members treat an innocent family member as a villain instead of the victim. (i mean, i am not a huge fan of victimizing, but sometimes, some people stand up to themselves and get treated as if they are the ones who started it which is pretty stupid) And sometimes, some family members don't treat their family member seriously, even if they are being honest. I like jokes, but there are times when it's not necessary to joke, and you must be real to yourself, because not everyone can take jokes, and people can dislike you for joking at the wrong time.

Like, what if some family member is constantly rude to you everytime you meet each other, even if you are trying to be nice?
What if some family member just constantly says rude and offensive things to you without thinking twice, and then hurt you and your relationship gets worse? (some family members can redeem themselves and become better people, but i am talking about the ones that are unlikeable 90% of times if that makes sense, not the ones that were unlikeable but became decent later)
And there are all kinds of family members. Some family members judge their younger family member by interests and criticize them for liking something and having fun. (one of my older sisters used to be like this making me hate her, but she's decent now) Some family members verbally abuse their younger family members, but try to excuse it with empty words such as "I'm older than you!" "I love you!" "We are related!" etc. And some family members also hit their family members, even if no one is misbehaving. (you know, some fathers or mothers hit their children even when they are not doing anything, and some husbands beat their wives, but sometimes, NOT out of jokes, there are some siblings who beat up their other sibling without feeling sorry, there are a lot of examples)
And this is possibly offensive, but some family members
s3xually abuse
their family member, which is one of the worst things to ever happen to anyone.
People can be corrupted, but some of them don't understand it, meanwhile some of them try to justify it as if it's normal thing to do.

Sorry if this is a black and white thing to say, and if it's not detailed enough. It sounded way better in my head.