I want to start off by saying that although there are other stories on this site like this one, I don't want you to think I am copying because this is a true story.
I haven't been much of a spiritual person in my life and I've had only one experience before this one. My mother, however, is very spiritual and I have learned many things from her about ghosts and spirits.
This happened two days after my 16th birthday. It was around 10:30pm or so I remember. Ironically, it was a full moon out. I had gone out to the graveyard to pray for the spirits that rested there. As I was leaving a gravestone caught my eye. It was one gravestone for two graves. Twin boys, Joey and Jacob Millimack were the names written on the stone. They had both died when they were only six. The very thought brought tears to my eyes and as I bowed to pray my knee hit the gravestone. Quickly, I said I meant no disrespect for the wind seemed to blow fiercely by me. I was scared that I had disturbed them but after a moment the wind died down so I thought my apology had been accepted. I said my prayer and left. I awoke at around 3:00am to the sound of laughter. It sounded like two little boys. I immediately thought of Joey and Jacob and began to get frightened that I really HAD disturbed them. The laughter stopped as soon as I thought that and I suddenly got cold and felt as if someone was hugging me. I'm not sure what happened after that because I blacked out for some reason.
The next few days after that, Joey and Jacob hung around with me, mischievous as they were. When I was with my friends, they would pull one of my friend's hair or trip them or something. My friends blamed it on me. I never got mad at Joey and Jacob, 'cause hey, that's' what six-year-olds do. My friends would get mad at me of course and I would apologize and say I was just bored. Every night when I went to sleep, I would always feel like someone was hugging me from behind.
Then one day, I came home to see that my room had been messed up. I disregarded it because I knew Joey and Jacob had been up to their tricks again, but my father thought otherwise. He got really mad and yelled at me because he had been the one to clean it the day before. That night, I didn't get my hug when I went to sleep. I haven't seen Joey and Jacob since, even when I've gone to the graveyard and called for them. They've disappeared. I do miss them but I don't think they'll ever be back.
However I do not believe that it was the twins that followed you at night? What makes you think it were the twins just because wind blew by you as you were at their grave? How do you know it wasn't something else? It's it funny that you were given hugs? By both of them or just one?
Red flag, waking up at 3am, another red flag, laughing as if they are taunting you at the 3am time, the other red flag is physical injuries they tried to cause to your friends. Not all 6 year old boys like to pray pranks, and what makes you so sure these two boys like to play pranks when they were alive?