Twin Separation Anxiety

Hi, I haven't been here in a LONG time. My twins are 4-1/2 right now and between the time I spent as a SAHM and the fact that my MIL watches them while I work now, they very rarely spend time apart. Anyways, when they are separated (to go to the store or spend the night at grandmas ect) my daughter is fine. She will ask about Riley once or twice but that's it. Riley, on the other hand, completely flips out. He will scream, cry, doesn't want to go to grandmas house or anywhere for that matter if Belle doesn't come with him. I was going to the store on day and I asked the kids if they wanted to come with me and Riley and Dalton headed for the car but after she put her shoes on, Belle started watching tv with her big brothers so I told her bye and walked out without her. Once Riley figured out that Isabelle wasn't coming he started crying screaming said he didn't want to go, we couldn't leave her, needed to go back get her fighting and not wanting to get buckled. In the end, she broke the tv's spell and ran out the door to come with us. I hate to traumatize the poor boy, but he's gonna hafta learn that it's ok to do stuff without her. When he does go (or she goes and he has to stay) everything he does brings it back and sets him off again-if it's time for a snack, he gets teary eyed and wants to know why she's not getting one to or "we can't watch a movie without Isabelle" "I want Isabelle to come play outside with me"
He did have one night that he spent with his buddy Tyler and he did much better. He spent about 5 min trying to convince me to let her stay too, but in the end he decided if it was the only way he could stay was without her he would deal with it. I don't really know anyone with twins, but I'm kinda hoping that this is "normal"? Any advice would be appreciated or at least knowing I'm not alone ardon:

 

I don't know about 4 year old twins but my 2 year olds get nervous when the other is not around. Usually they will ask for each other and when I took Kevin to an appt alone the other day, Patrick nearly lost his stuff! He cried about it for 1/2 hour after I left.

 

Mine are the same way. Last weekend, DH took Georgia to the Park and Ella kept asking where is Gigi? every few minutes. But when it was the other way around, Georgia cried for a good 20 mins.

 

One of my twins hates going out without his brother. He gets really nervous and shy. He can't have a good time even if we go out to the park or to his favorite restaurant. When he was younger, he used to cry whenever we took him somewhere without his brother. Now that he is older, he doesn't cry but doesn't really have fun by himself. He also doesn't want to play with other kids during playdates, only with his brother. My DH and I have been taking them out on separate outings once in a while because we think it's a good idea to get them used to spending time alone. He has gotten better as he got older and as he gets more practice being apart.

His brother, on the other hand, is totally fine by himself. Actually, he rather enjoys the opportunity to play with other kids or spending time alone with mommy or daddy.

We plan on putting the kids in separate classes for preschool in the fall. I think it will benefit both of them in different ways.