Search Results: marry someone the same age

I have one very outgoing little sister, and even though she’s only just turned eleven she’s already boy-crazy. Every few weeks she comes home from school or from a friend’s house or wherever, and tells me about a new boy she met who she’s started dating, and about how she’s so in love with him. She even talks about marrying them and having kids with them one day. However, within a week or two, something happens that causes them to break up, and eventually she meets a new boy, continuing the cycle.

At first I just thought it was funny and cute, but recently it’s started to worry me. All her friends are apparently the same way, and for some of them it’s landed them in some pretty inappropriate situations. For example, one of my sister’s friends, who’s around 11, is supposedly sexually active with her 13 year old boyfriend. That’s a scary thought.

Do any of you have younger siblings, children, or other family members or friends who are always infatuated with someone despite their age? Do you think it’s cute and that there’s no harm in it? Or do you think it’s something worrying that should be discouraged?

So... I was going to go to her party because I'm her sister BUT I didn't want to go because I'm a NON drinker and she wants to go out drinking.
So I told her I can't go because we are moving that day, but turns out we are NOT moving that day, but the week after, so I told her aw well too bad because I already sold the tickets. So she BOUGHT me tickets and said I can pay her back. I said... OK.
THEN I told her I can't stay with her and her friends in the same hotel room so I booked a hotel room for 200$, I am not sure if it is refundable (because they will go drinking until who knows when and to clubs and bars where I don't want to go).
THEN she tells me that she doesn't want to take me back to the airport the next day because she wants to spend time with her friends, I guess she told me to get a UBER or taxi and we are going to be THREE hours from the airport where she bought my plane ticket... so I won't have a car. I'm shit out of luck if I went and she ditched me like that.

I guess if I refuse to go then I owe her 160 for the plane tickets and 200 for the hotel stay (or I can call the cancel the hotel and tell her I refuse to pay for the plane tickets but that's mean).

The thing is my sister is knows to ONLY care about her feelings and I must do what she says I should do or else she will be MAD and disown me and treat me like SHIT. She is the type to steal someone else's husband, cheat on him after having his kid, lie to the next guy that she wants to marry him and cheat on him and bad mouth all her exes... so what should I do here? My dad and brother disowns her because she is a manipulative, compulsive liar who is full of herself (narcissist) and they can't trust her for SHIT.

Yes go to her party? No don't go?

take note that I live 17 hours drive from her, I have my own full time gig as a stay at home mom (very little non-school age kids) and we are in the process of moving...