Is it normal custom for a Hispanic woman in the USA to co-sleep with their child/children in the same bed?

I've known my girl friend for about a year now. We've been dating exclusively for 3 months. I knew with our conversations by phone over the past several months that her 6 year old daughter sleeps in the same room in a bed next to my girl friends'. Since a few months ago Its now clear that her 12 (twelve) year old son will sleep in the same room too in the other bed when the daughter is gone with her father. But when the daughter is at home with mom, the son sleeps in the same bed as mom and the daughter sleeps in the other bed...all three in the same room. I know nothing strange is going on. Mom just hasnt cut the chord yet. I know this woman likes me alot. However, even though the son has his own room, appearantly he seldom sleeps in it. When the daughter is gone and its just me, the son and my girl friend at her house....She wont tell the son to sleep in his room, therefore, I sleep on the couch. When the children are not there which is extremely rare, then of course she has no problem with me sleeping in the same bed with her and we get to DO IT! Its beginning MORE to bug me, since I've slept on the couch 6 or 7 times now. The other days I'm at my house. How odd is this co-sleep behavior? The other night the mom and I were watching a movie, the son decided, before he even knew what it was about, he didnt want to watch it. Every 10 minutes or so He continued to pace from his room into the room where we were watching TV, as if he didnt know what to do with himself, almost as if he didnt want to be away from her or I hate to say he's somehow competing for her affection. He's one of them kids these days that only video games seem to keep him occupied. I should say though He is a great kid in many respects, but I wonder what may be the pschological effects to the son due to this co-sleep behavior. The mom told me its normal in her hispanic culture for the children to sleep with parent;/s. I dont think so at 12 years old when the child has his own room. And I'm quite sure when Im not at the moms house, they all still sleep in the same room. Any Comments appreciated.