Is it normal: that my boyfriends younger sister does this?
So my boyfriends little sister always wants to follow us everywhere, and I mean everywhere. At first I felt bad because she would cry so yea we would let her hangout with us but when we want alone time we have to sneak around her because she gets really mad at my boyfriend for not wanting her around. She throws these tantrums, so her parents guilt my boyfriend into doing whatever she wants. My boyfriends 21, so I think he's old enough to do what he wants without his parents forcing him to take his little sister everywhere. Oh yeah and she's always says that everything my fault and constantly contradicting me. I don't do or say anything because I have no brothers or sisters so I don't know if this is just the way they are, but is this a normal thing to put up with? And if anyone has experienced this do you have any suggestions?
P.S. His sister is 14, and he is 21, we have been together for 3 years.