I thought the young pregnancy thing was a joke

My 13 year old, yes, you heard me right, 13 year old sister is pregnant. Bro, what the fuck. The main concern is that she's 13 of course, why is she having Intercourse, and with who? The second concern is that she drinks and vape a lot – concern for the child –.

Edit: The father is her boyfriend, he is 16 (Incorrect), and she wanted to get pregnant.

Edit 2: There are double the comments from when I went to sleep. I will be answering them throughout the day.

Edit 3: She stopped drinking and vaping. I haven't given her much credit because I thought she was just fully stupid, though maybe, just maybe, she will change for the better. A wake-up call. Also, if it seems like I'm heartless sometimes it's because I am unable to feel normally. I have some brain problems that make me not know social situations.

Edit 4: The father is 15, not 16, though it's still bad.

Edit 5: This is the US, so the age of concent is 18.