He is emotionally abusive, using his stories of beating up people to control you. You are allowed to ask someone else to stop yelling/abusing your child. That is what a good parent does! He is two! He doesn’t need verbal abuse thrown at him regularly.
Please, call woman’s aid, the local police domestic violence line. You need to get out safely. You need to take the children with you. They need to be away from this vile man.
Are you married? Is the house his? Yours? Jointly owned or rented? I am guessing due to his abuse you have no friends or family nearby by design.
You need to get a all birth certificates and passports for yourself and all children in a safeplace for your escape. Also, copies of all financial status, bank accounts, savings, pensions etc. Know where you are at for CMS or more depending on your legal status.
Get your get out plan together and then one day when he is at work, run! Run like you have never before. Try and have a bag packed for everyone with some basics. Either hide somewhere or keep in the trunk of your car if you have on.
Before this point if you have any valuables or anything you think you can’t live without, ie antiques from grandma etc, take out a storage locker and slowly over a week put it in there. Small stuff, do the same for important paper work if you have no where else to put it. Nothing to noticeable. Or come up with a plausible repair story, getting it refinished.
Do not talk about leaving. Just settle back in as if everything is ok. Try and keep the peace. Talk about going to counseling. Leaving is one of the scariest time of a person in an abusive relationship. Be careful!
Once you have left, call the local police and advise them that you have left due to abuse. That you are going to your family for safety. Please don’t tell ex. Why do this step you ask!!! Because he seems the type to report you missing with your children.
As soon as you get to your destination, if it’s allowe/legal go to the courts and try and obtain an emergency order against him for no contact and for emergency custody of your children due to abuse.