What should my gf and I do sister's boyfriend and her mom
Excuse any typing mistakes I make, I'm still relatively new to making posts on reddit.
I (21m) am dating my girlfriend (19f). She has a sister (17f) who just got out of a toxic relationship around 3 months ago. I'll name her Sarah for privacy. So Sarah had got out of her relationship and about 2 weeks later a guy texted her on Facebook.
My gf and I thought that was weird and told Sarah that is weird as well. Sarah decided to keep texting this guy, who keep in mind didnt have anything depicting who he is on his account (ex. Age, work, where he lived). He only has 2 pixtures of himself on the account which my gf and I found suspicious.
Later on my gf and I find out that he's 22. We immediately called it weird and that he's a pedo. But Sarah found nothing wrong with it and neither did her mom. They constantly hide from their family that Sarah is dating the guy but still see nothing wrong with the relationship. Her mom keeps making up excuses on how its not weird or potentially bad for sarah, and compares my gf and I's relationship to theirs. Although, the mom has been in abusive relationships and was married to someone who SA kids in her family. But she says my gf and I dont have a good relationship judgements.
Now Sarah and her bf are planning to have sex, ONLY after she turns 18 with only birth control and no protection. Idk if my gf and I are crazy to feel like this about the relationship but Sarah and her mom keeps defending it like its morally right.
What should my gf and I do?