Think about this for a minute, OP.
Do you think he wants full custody?
Do you think he's thinking - 'Right! There's no way she's leaving me and taking him. I want to be the one there to give him a bath, to put him to bed. I want to be the one to make sure he's eating properly and getting enough sleep, and spending every evening with him. I'm going to have to change my work hours and of course I know there'll be no going out for me, but it's worth it to care for my boy. I want to be the one doing the potty training, the clothes shopping, the sleepless nights..'
Really? Really?
No. Of course not. He doesn't want to lift a finger to share the daily care of your son now, of course he doesn't want to live alone with him and do the lot. It would be his worst nightmare, frankly!
Surely you can see that?
So why is he saying this? Indeed - why does every abusive, lazy, totally-disinterested-in-childcare fucker say exactly the same?
As lots of others have said, it's about control. They (quite correctly, and cleverly) try and think of the one thing which will scare you into staying with them and carrying on taking their abuse, cooking their meals and washing their pants. And this is it - I'll take your children off you.
It's laughable, really. Yes, as if a court is going to look at a couple, one of which has always been primary carer, and decide that yes, we'll give full residence to the other parent, who also happens to have a conviction. Yup.
As others have also said, the absolute MOST he would get is shared residence. Ooh yes, lots of childcare PLUS lots of opportunities for you to have child-free time and go out on the pull! Ha - no thanks!
The best way to deal with this nonsense?
'Fine, then I guess it will go to court. I don't believe for a second that you will get full residence, so don't even try and scare me with that nonsense. What is possible, though, is shared residency - 50/50 care. Please do go to court, because I think that would be a good thing - you've barely bothered to do any care for DS since he was born, so it would be great to see you step up now we're separating. I've often thought how unfair it is that I do all the work, so it's a relief to see that your plans include doing your fair share of childcare and giving me child-free time to go out and have a social life of my own... After all, I'm sure we're both going to want to move on with new
relationships one day!'
And watch him turn round and snarl at you that you can fuck right off, there's no way he's gonna be sitting in on a weekend mopping up after YOUR kid so you can go out and fuck other blokes, he'll be having him every other Saturday afternoon and no more, if you think he's going to be your babysitter you've got another think coming...'
And result 