Muscular dystrophy (MD)

Hello. Anyone who have MD or family who has it? Can u pls help me how should i go about it. My father in law has it. So is my husbands sister and his brother. They dont want to tell me which type. But i know its the rare one. So my FIL have muscle weakness he is in his wheelchair. I guess he was diganoes at the age 50. My SIL is now 30++ she cannot carry heavy stuff and has learning disabilities her brain is like a child. And also my BIL is also have weakness muscle but they still can walk. I dont know if these help. Im not sure what that is. I have 9 months old baby what are the chances she has? And i wanted more children but i was really dissapointed to only know about this few month ago and i dont know what to do. Pls help? Thank you. Really need support xX