Definitely get some legal advice, its good you are not answering him straight away, its his problem after all and you need time to think what you want to do and how to do it.. perhaps think about how you want to set boundaries for him visiting the kids, not in a vindictive way but so that the kids are well cared for and not messed about emotionally and physically.. You dont have to let him tell you whats going to happen but you can say no politely and firmly, I havent got any little ones so have a look round on threads where people have got kids, and see how they handled things.
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Once lost but now found and happily married again!