Special Needs Children with Undiagnosed Genetic Syndromes

I am a Mom of a special needs child with a Undiagnosed Genetic Syndrome. He is 4 and is a twin, his brother is healthy. We also have a 6 year old daughter who is healthy as well. He has done a ton of genetic testing. So far they have come up with nothing. Just wanted to start a board for other Mommy's like me...