How can I support my Lgbtq+ sister going through puberty and in social situations? -Anonymous
This is a very good question, and I hope my advice is helpful to you <3
The main thing is: Be there for her. If she has questions, do your best to answer them. If she needs a listening ear, or a big hug, sit there and let her talk, or supply said hug. Just simple things like that can go a long way, even if it doesn't seem like it. And don't judge her, or say her questions are silly, or anything like that, even if you might think that they are. I know that, especially with siblings, this can be a hard thing to do, but try to avoid it, if possible. (Of course, everyone's human, and you are siblings, so of course things can't be perfect all the time)
If you have access to LGBTQ+-related articles/books that talk about puberty for LGBTQ+ kids, share them with her! Even if she already knows the information that's in the materials, chances are that she'll be happy/grateful to you for taking the time to give them to her. Like I said, small things go a long way, especially if the gestures relate directly to what the person is dealing with/going through. And if she asks for help researching something, offer to help - who knows, you might learn something new, and it's a great way to bond with your sister.
As for social situations....it comes back to: Be there for her. If someone is giving her a hard time for being LGBTQ+, stand up for her, and make sure she's safe. If someone did give her a hard time and you weren't there, let her talk about it if she wants to, and if she doesn't, offer her some support, such as a hug, or a distraction. If she has anxiety over certain social situations, such as school, or hanging out with friends, let her talk to you, if she wants, and offer whatever advice that you can - or even just offer support, if you don't have any advice.
Basically, it all comes back to the same thing: Be there for her, in whatever ways that you can, wherever you can. Navigating puberty and social situations as an LGBTQ+ person can be tough, and I'm sure that it will make her feel better to know that you have her back, and that she can count on you for support if she needs it. <3