Girl tweets her brother's reaction to finding out she's not 'fully his sister' and it's too emotional

Girl tweets her brother's reaction to finding out she's not 'fully his sister' and it's too emotional

For many of us, family is one of the most important things in life. We depend on them, we do our best for them, and - ultimately - we love them... even if they can be irritating sometimes (and if my younger brother happens to be reading this: yes, I'm talking about you).

But being part of a family isn't always as simple as it sounds. All sorts of things can jeopardise the relationship a person has with their nearest and dearest, and, quite often, there's not much that can be done to stop it.

So, when one guy found out that his older sister was actually his half-sister, there was no telling how he would react.

Pam Lara, an 18-year-old Austin, Texas, tweeted last week to say that her 17-year-old brother had only just found out that she was not his "full" sister - but that his response to the news was the sweetest thing ever.

Rather than be upset by the revelation, Pam's younger bro bought her some of her favourite snacks as a token of his appreciation, and penned her a heartfelt letter about how he felt towards her.

Here's what the note says:

"I just wanted to let you know how much I love you. I don't care what people say, you are always going to be my sister. My full-blooded sister. 

"You are the best thing that happened to me. I love you with all my heart.

"Thank you for helping me on my worst and thank you for leading me the right way. 

"I will always be there for you just like you [have] always been there for me. I love you.

"With love, your annoying brother."

And everyone else's responses were just as adorable.

In an interview with People, Pam explained why her brother had been kept in the dark for so long.

"I had to keep it a secret from everyone just so it wouldn’t affect our family," she said. "And mostly because I was scared that I was going to be looked at differently by my siblings."

She went on: "My older sister found out in the most unpleasant way, but it was a relief that she understood and agreed to keep it a secret. My brother ended up finding out sooner than expected from my sister through an argument."

The teen was also keen to make sure of one important point: nothing could change the fact that she and her brother are family.

"[The Twitter post is] comforting for others who are also afraid of facing it," she explained. "Either way, blood does not define family. I have never, nor will I, see my brother any differently."

As sweet as the tweet may be, then, it also carries a significant life lesson: DNA does not determine family. Half-siblings, step-parents, adopted relatives - none of it really matters in the end. What's most important is that families stick by each other and do what's best for those they care about most.