"yes the atmosphere at home is sometimes very horrible for them but at least they can sleep in there own beds in there own environment with there own toys"
Op I'm sorry but I'm coming at this from the perspective of having been in the position your kids are.
Own bed etc is meaningless, I'd have happily slept in a new bed and left everything behind if it meant not living in that atmosphere!
Not feeling like throwing up when I heard dads key in the door
Not feeling terrified every time mum or me or my siblings did something "wrong" that would make dad kick off - that included spilling things or breaking things accidentally.
Not clock watching because I knew if mum was even 5 mins "late" getting in from work or even shopping or something equally innocent dad would lose it, starting with accusations of her cheating and escalating to doubting our paternity.
Hoping mum would make a dinner he wanted each evening even if if it were something we hated as that meant a peaceful evening.
Having to time whether to ask for something as simple as a signature on a school permission slip so as to not anger him - if we asked too soon "why are you bothering me with this now it's not happening until..." "Why have you left it till now to ask?!"
Having to judge whether we thought we could "get away" with putting music on or watch a "kids" programme or if he was in a "bad mood" and it wasn't worth the risk.
Not ever being able to have friends call on you as he was so unpredictable (but then he'd also use that to make out we'd no friends)
So yea, I'd have happily slept in a different but SAFE bed than live like that!
"I didn't want warm beds and toys, I wanted safety." See?
As the tenancy is in your name you can have him removed. If you are (as I suspect from comments) in social housing, many have depts that deal specifically with dv situations and can help to either remove him (and change locks and beef up your home security) or get you moved to a new property quickly without his knowledge.
The police and Dv agencies can also help with this but they need YOU to tell them and ask for their help.
You say a photo isn't enough proof but going to the dr and getting injuries recorded contributes to evidence.
Be more proactive in working to get away from him, get all the help you can and DON'T listen to him or his bloody mother! They do not have you or your DCs interests at heart!