Well, if you have ILR you do have options, because you can remain in the UK even if your marriage breaks down. Honestly, it sounds like things might be better for you if you got out of your MIL's house, maybe found a job you enjoyed that gave you a life of your own, so to speak. But missjoules is right; you cannot just take your child out of the UK without permission from the father. The UK takes international kidnapping very seriously, and without permission that's what they'd consider it, regardless of the fact that you are the mother.